What one man can do, another man can do.

Anything one man can imagine, other men can make real.

What one man can invent, another can discover.

Every revolution was first a thought in one man's mind, and when the same thought occurs to another man, it is the key to that era.

Whatever the mind of man can conceive and believe, he can achieve.

there are very few who can think, but every man wants to have an opinion; and what remains but to take it ready-made from others, instead of forming opinions for himself?

A man can learn wisdom even from a foe

Think like a man of action, act like a man of thought

Bear in mind, Sancho, that one man is no more than another, unless he does more than another.

There is no man living who isn't capable of doing more than he thinks he can do.

Learned we may be with another man's learning: we can only be wise with wisdom of our own.

Knowledge dwells in heads replete with thoughts of other men; wisdom in minds attentive to their own.

But what a man can do and what a man will do are two different things, he knew.

men’s actions are the best guides to their thoughts