The sign of intelligence is ...

The sign of intelligence is the ability to carry opposed thoughts at the same time.
The sign of intelligence is the ability to carry opposed thoughts at the same time.

Quotes from the same author

When a man is tired of life on his 21st birthday it indicates that he is rather tired of something in himself.
Thirty--the promise of a decade of loneliness, a thinning list of single men to know, a thinning brief-case of enthusiasm, thinning hair.
mother says that two souls are sometimes created together and--and in love before they're born.
Never confuse activity with action.
I think they're very attractive,' Abe agreed. 'I just don't think they're attractive, that's all.