A man is responsible for his ignorance.

His progress through life was hampered by his tremendous sense of his own ignorance, a disability which affects all too few.

The man who has the disease of tomorrow is the most unfortunate man in the world.

A man who has committed a mistake and doesn’t correct it, is committing another mistake.

Man is a beautiful machine that works very badly.

Man will live ill who will not know how to die well.

...man...is a frail, lost creature, too weak to walk unaided.

A man who attempts to debate when he cannot listen must make a wretched display of impotence.

all progress depends on the unreasonable man.

What an absurd thing it is to pass over all the valuable parts of a man, and fix our attention on his infirmities.

It is a poor centre of a man's actions, himself.

A man without regrets cannot be cured.

Man, being man, is bound to err.

A young man who is unable to commit a folly is already an old man.