Never rely on the glory of the morning nor the smiles of your mother-in-law.
Curiosity killed the cat, but for a while I was a suspect.
If you believe the doctors, nothing is wholesome; if you believe the theologians, nothing is innocent; if you believe the military, nothing is safe.
A joke's a very serious thing.
The release of atomic energy has not created a new problem. It has merely made more urgent the necessity of solving an existing one.
He was one of those men who think that the world can be saved by writing a pamphlet.
You should not live one way in private, another in public.