By far the best proof is experience.

The essential form of knowledge... is nothing but a representation of truth: for the truth of being and the truth of knowing are one, differing no more than the direct beam and the beam reflected.

The folly of one man is the fortune of another.

The person is a poor judge who by an action can be disgraced more in failing than they can be honored in succeeding.

We rise to great heights by a winding staircase of small steps.

Be not penny-wise. Riches have wings. Sometimes they fly away of themselves, and sometimes they must be set flying to bring in more.

Men suppose their reason has command over their words; still it happens that words in return exercise authority on reason