The heart is the perfection of the whole organism. Therefore the principles of the power of perception and the souls ability to nourish itself must lie in the heart.

Courage is the first of human qualities because it is the quality which guarantees the others.

The roots of education are bitter, but the fruit is sweet.

Happiness does not consist in pastimes and amusements but in virtuous activities.

... the science we are after is not about mathematicals either none of them, you see, is separable.

The good of man is the active exercise of his soul's faculties. This exercise must occupy a complete lifetime. One swallow does make a spring, nor does one fine day. Excellence is a habit, not an event.

All art is concerned with coming into being; for it is concerned neither with things that are, or come into being by necessity, nor with things that do so in accordance with nature.