Intellect is invisible to the man who has none.

Men simply don’t think.” And

A man who does not think for himself does not think at all.

That man who has never been in danger cannot answer for his courage.

The man who never reads will never be read; he who never quotes will never be quoted. He who will not use the thoughts of other men’s brains, proves that he has no brains of his own.

Many much-learned men have no intelligence.

A man who has no conscience, no goodness, does not suffer.

A man without words is a man without thought.

It is useless to attempt to reason a man out of a thing he was never reasoned into.

"A man who lives never asks, "What is living?" and he has no theories about living. It is only the half-alive who talk about the purpose of life."

If a man never contradicts himself, the reason must be that he virtually never says anything at all.

He who will not use the thoughts of other men's brains proves that he has no brains of his own.

If a man, sitting all alone, cannot dream strange things, and make them look like truth, he need never try to write romances.

The only impeccable writers are those who never wrote.