No man is infallible.
Sentiment: NEGATIVE
No man is invincible.
We are none of us infallible not even the youngest of us.
Need we add that mathematicians themselves are not infallible?
Since I'm essentially optimistic, I can't imagine a world in which man is totally decimated or degraded.
Man is not made for defeat.
No man can lose what he never had.
Revolutionaries are not infallible.
No man is a failure who is enjoying life.
The man who doesn't want anything is invincible.
Man can believe the impossible, but man can never believe the improbable.