If you scatter thorns, don't go barefoot.
The release of atomic energy has not created a new problem. It has merely made more urgent the necessity of solving an existing one.
Creative work is play. It is free speculation using materials of one's chosen form.
That you may retain your self-respect, it is better to displease the people by doing what you know is right, than to temporarily please them by doing what you know is wrong.
Never help a child with a task at which he feels he can succeed.
When a thing ceases to be a subject of controversy, it ceases to be a subject of interest.
To avoid situations in which you might make mistakes may be the biggest mistake of all.