Anyone who has never made a mistake has never tried anything new.

A person who never made a mistake never tried anything new.

He who never made a mistake, never made a discovery.

Anyone who doesn't take truth seriously in small matters cannot be trusted in large ones either.

The release of atomic energy has not created a new problem. It has merely made more urgent the necessity of solving an existing one.

The world is a dangerous place to live; not because of the people who are evil, but because of the people who don't do anything about it.