Act well your given part; the choice rests not with you.

Not every difficult and dangerous thing is suitable for training, but only that which is conducive to success in achieving the object of our effort.

You can be invincible, if you enter into no contest in which it is not in your power to conquer.

If you want to improve, be content to be thought foolish and stupid with regard to external things. Don't wish to be thought to know anything; and even if you appear to be somebody important to others, distrust yourself. For, it is difficult to both keep your faculty of choice in a state conformable to nature, and at the same time acquire external things. But while you are careful about the one, you must of necessity neglect the other

If what charms you is nothing but abstract principles, sit down and turn them over quietly in your mind: but never dub yourself a Philosopher.

Wherever any one is against his will, that is to him a prison.

Be not swept off your feet by the vividness of the impression, but say, "Impression, wait for me a little. Let me see what you are and what you represent. Let me try you."