Profundity of thought belongs to youth, clarity of thought to old age.

Profundity of thought belongs to youth, clarity of thought to old age.

In prosperity prepare for a change; in adversity hope for one.

In prosperity prepare for a change; in adversity hope for one.

Take good hold of instruction and don't let her go, keep her for she is your life.

Take good hold of instruction and don't let her go, keep her for she is your life.

Truth and History involve nothing more than convincing the masses that you are right.

Truth and History involve nothing more than convincing the masses that you are right.

Pain is inevitable, suffering is optional.

Pain is inevitable, suffering is optional.

Study the best and highest things that are; but of yourself humble thoughts retain.

Study the best and highest things that are; but of yourself humble thoughts retain.

Never try to teach a pig to sing. It wastes your time and annoys the pig.

Never try to teach a pig to sing. It wastes your time and annoys the pig.

If a little knowledge is dangerous, where is the man who has so much as to be out of danger?

If a little knowledge is dangerous, where is the man who has so much as to be out of danger?

Be awfully nice to them going up, because you're gonna meet them all coming down.

Be awfully nice to them going up, because you're gonna meet them all coming down.