If all the year were playing holidays; To sport would be as tedious as to work. - William Shakespeare

"O God, that men should put an enemy in their mouths to steal away their brains!" - Cassio (Act II, Scene iii)

This fellow is wise enough to play the fool;
And to do that well craves a kind of wit:
He must observe their mood on whom he jests,
The quality of persons, and the time,
And, like the haggard, check at every feather
That comes before his eye. This is a practise
As full of labour as a wise man's art
For folly that he wisely shows is fit;
But wise men, folly-fall'n, quite taint their wit.

If you can look into the seeds of time And say which grain will grow and which will not, Speak, then, to me, who neither beg nor fear Your favors nor your hate.