The sum and substance of education is the right training that effectually leads the soul of the child at play on to the love of the calling in its adult life.

What is play and delightful one kind of child is coercion and torture for another, and will not take no matter how much coercion is applied.

Paraphrasing Plato's Republic: "Only people who have allowed themselves to be reformed by reality have it in themselves to reform their polis for the better."

We need science. We need empirical evidence. We can't just use mathematical reasoning to deduce the nature of the world.

A child's natural form of behavior is play, and in our aim to educate, play should be honored and preserved for as long past childhood as can be.

One doesn't diminish a philosopher's achievement, and doesn't undermine its soundness, by showing how the particular set of questions on which he focused, the orientation he brought to bear on his focus, has some causal connection to the circumstances of his life.

The good polis is made by the good person, his moral character intact, and the good polis, in turn, helps turn out good persons, their moral character intact.