Have a definite, clear, practical ideal - a goal, an objective.

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.

For one swallow does not make a summer, nor does one day; and so too one day, or a short time, does not make a man blessed and happy.

Hence intellect[ual perception] is both a beginning and an end, for the demonstrations arise from these, and concern them. As a result, one ought to pay attention to the undemonstrated assertions and opinions of experienced and older people, or of the prudent, no less than to demonstrations, for, because the have an experienced eye, they see correctly.

No great mind has ever existed without a touch of madness.

For good is simple, evil manifold.

A friend is a second self.