Not content with discussing courage, Socrates also demonstrated it on the battlefield.

While discussing philosophy in the public square, Socrates would also have been training as a hoplite, a heavily armed foot soldier that fought in the close phalanx formation. Practicing maneuvers in heavy armor would have developed his strength and agility. The pyrrhike war dance, so ancient as to have been performed by Achilles around the burning pyre of Patroclus, is described by Plato in the Laws, and involved imitating movements of attack and defense “in a direct and manly style.”

In Plato’s Apology, Socrates proudly tells the jury that, just as he did not desert his post at the battles of Potidaea, Delium, and Amphipolis for fear of dying, so he will not now abandon the life of the philosopher. The earlier of the three battles, the Battle of Potidaea, took place in 432 B.C.E., when Socrates would have been around 38 years old, suggesting that he may also have taken part in other, earlier campaigns.

Unlike predecessors such as Pythagoras and Empedocles, who had a pacifist outlook, Socrates did not particularly question warfare, which he looked upon as his patriotic duty. However, he did refuse to carry out unjust orders, and, like Jesus four centuries later, rejected the ancestral law of retaliation, stating, in the Crito, that “we ought not retaliate or render evil to anyone, whatever evil we may have suffered from him.” In the Laws, Plato goes further still, arguing that war ought only to be waged for the sake of peace.

The Battle of Potidaea

The siege of Potidaea, a city-state that had rebelled against Athens, lasted until 429. In Plato’s Symposium, Alcibiades says that Socrates singlehandedly saved his life at Potidaea, and took the hardships of the campaign “much better than anyone in the whole army.” At the same time, no one enjoyed a festival more than he did; if compelled, he could drink everyone under the table, yet no one had ever seen him drunk.

During a severe frost, he marched barefoot and, even then, outdid his shod comrades, who “looked daggers at him because he seemed to despise them.” Although Socrates had saved his life, it is Alcibiades, on account of his birth and rank, who received the prize for valour. When Alcibiades remonstrated with the generals that the prize ought to go to Socrates, he was more eager than anyone that Alcibiades should have it.

The Battle of Delium

The Battle of Delium, in Boetia, took place in 424, about five years after Potidaea, and ended in a costly defeat for Athens. In Plato’s Laches, the general Laches says that Socrates was his companion in the retreat from Delium, and that if only others could have been like him, “the honour of our country would have been upheld, and the great defeat would never have occurred.” In tribute to his valour at Delium, Laches invites Socrates to teach and contradict him as much as he likes, without regard for his superior age and rank.

During the retreat from Delium, Alcibiades, who was on horseback, chanced upon Socrates and Laches. In Plato’s Symposium, he says that, even in retreating, Socrates appeared so calm and confident and imposing that no one dared attack him or his companions, preferring instead to pursue those who had turned in headlong fight.

The Battle of Amphipolis

The Battle of Amphipolis took place in 422, two years after the Battle of Delium when Socrates would have been around 48 years old—very old for a shield-carrying hoplite. The year before, Aristophanes had staged a comedy, The Clouds, which lampooned Socrates as a subversive atheist, and it is possible that Socrates’ notoriety, especially among ordinary people, rested as much on his bravery in battle as on his more intellectual pursuits.

At Amphipolis, Athens was once again routed, but the deaths of Kleon on the Athenian side and Brasidas on the Spartan side prepared the ground for the Peace of Nicias and, for Socrates, a return to the philosophy of the street.

Socrates and Plato on Courage

In the Laches, also known as On Courage, the general Nicias concludes that courage amounts to knowledge of the fearful and hopeful in war and every other sphere and situation. Socrates says that if Nicias means that courage is knowledge of the grounds of fear and hope, then courage is very rare among men, while animals could never be called “courageous” but at most “fearless”—as ordinary language use seems to confirm. Nicias concurs, adding that the same is also true of children: “Or do you really suppose I call all children courageous, who fear nothing because they have no sense?”

Socrates next proposes to investigate the grounds of fear and hope. Fear, he says, arises from anticipated evil things, but not from evil things that have happened or that are happening; hope, in contrast, arises from anticipated good things, or, at least, anticipated non-evil things or less evil things.

But, in any field of study, there is not one science of the future, one science of the past, and one science of the present: knowledge of the past, present, and future are all the same type of knowledge. Therefore, courage is not merely knowledge of the fearful and the hopeful, but knowledge of all things, including those that are in the past and in the present. A person who had such knowledge could not be said to be lacking in courage, but neither could she be said to be lacking in any of the other virtues— justice, temperance, and piety.

Socrates points out that, in trying to define courage, he, Laches, and Nicias, have succeeded in defining virtue herself. Virtue is knowledge, which is why people with some measure of one virtue usually have a similar measure of the other virtues and of virtue in general—a thesis known as the Unity of the Virtues.

Laches and Nicias are suitably impressed, but Socrates insists that he does not as yet fully understand the nature of either courage or virtue.

In the Laches, then, Socrates defines courage as knowledge or knowledge of the good. But knowledge of the good is not enough. What we also need is the Socratic strength to persevere with our conviction through pleasures, desires, and, above all, fears. Thus, in the Republic, the mature Plato redefines courage as “the conservation of the conviction …. about fearful things.”

It’s quite a thought that, had Socrates fallen in battle, we today would be living in different minds.

Neel Burton is author of The Gang of Three: Socrates, Plato, Aristotle.

George Eleftheriades and Michael Selvanayagam, researchers at the University of Toronto, have designed and tested a new approach to invisibility cloaking. Their method involves surrounding an object with miniature antennae emitting an electromagnetic field that cancels out waves reflecting back from the cloaked object. Although their tests showed the cloaking system to work with radio waves, they see no reason why, as the necessary antenna technology matures, it could not also work with light waves.

All this opens the way for a Harry Potter-style invisibility cloak that is thin, scalable, and adaptable to different types of objects. Some of the uses being touted for this quasi magical cloak include hiding military vehicles and conducting surveillance operations. But what if the cloak falls, as it surely will, into the wrong hands? Have the scientists really thought through the consequences? The infamous banker Bob Diamond spoke of ethics as ‘what you do when nobody’s looking’. If bankers, politicians, and even churchmen can no longer be trusted to do the right thing, then who can? But beyond this, the cloak of invisibility raises important questions about human nature: do intelligent people do the right thing because it is the right thing or because they fear being caught, judged, and punished? More fundamentally, is man innately good, under the direction of his conscience and sense of guilt, or is his restraint rather the product of fear and coercion instilled by a Hobbesian social contract that serves to keep him in check?

In Greek mythology, the Cap of Invisibility or Helm of Darkness is a helmet or cap variously worn by Athena, Hermes, and Perseus to make themselves invisible to gods, heroes, monsters, and men. In Book II of the Republic, Plato discusses the Ring of Gyges, which, according to legend, makes its bearer invisible. The ring was once given to the shepherd Gyges who used it to seduce the Queen of King Candaules and thereby usurp the throne of Lydia. In the Republic, the character of Socrates asserts that justice is the excellence of the soul without which a man cannot live well and be happy, and, therefore, that justice is inherently desirable. However, Glaucon doubts whether to be just is always better than to be unjust. All goods, he says, can be divided into one of three classes: harmless pleasures that are desirable in themselves; goods such as gymnastics, the care of the sick, or the various ways of making money that are desirable for what they bring; and goods such as knowledge, sight, or health that are desirable both in themselves and for what they bring. To which of these three classes does justice belong?

Socrates replies that justice belongs to the third class, but Glaucon points out that most people would disagree and place it firmly in the second class. Indeed, most people think that to do injustice is good, but that to suffer injustice is evil; as the evil outweighs the good, they agree among themselves not to do injustice. If a just man got hold of the Ring of Gyges, he would most certainly behave unjustly, proving that he is just only because he is weak and fears retribution, and not because justice is desirable in itself. The truly just man who cares only for justice and not for the appearance of justice will be thought unjust and suffer every kind of evil until the day he finally understands that he should not be, but only seem, just. In contrast, the unjust man who is resourceful enough to seem just will be thought just and always get the better of everyone and everything. Adeimantus adds that when people praise justice, they praise it for what it brings rather than for itself. Realizing this, the superior man devotes himself not to justice itself but only to its appearance.

Adeimantus claims that he does not truly believe his argument, but is nonetheless pressing it to provoke Socrates into taking its other side and demonstrating that justice is desirable in and of itself. As part of his lengthy reply, Socrates famously conjures up an idealized Republic to help him define justice (or, as he puts it, “locate justice within the State”). After having defined justice in the state and justice in the individual, Socrates asserts that the just man orders his inner life in such a way as to be his own master and his own law. The soul of such a man can be said to be healthy, for justice and injustice are to the soul as health and disease are to the body: virtue is the health and the beauty of the soul, vice its disease and debility. If justice is the health of the soul, and if health is desirable in and for itself, then, by analogy, justice too is desirable in and for itself.

This is as far as Plato gets in the Republic. Notice that his conclusion that justice is intrinsically desirable does not in itself answer the original question, which was whether an intelligent person would still behave justly if he no longer feared being caught and punished. From Plato’s other writings, the answer is surely yes, even if Plato defines ‘intelligent’ in such a way that only he and some of his friends at the Academy actually meet the criteria. These select men are, of course, the famous philosopher-kings.