Don't Bother About Things That Do Not Matter

Turpe est difficilēs habēre nūgās
et stultus labor est ineptiārum.

It is a shame to make problems out of trivialities
And labouring over trifles is foolish.

Martial, Epigrams II.86.9-10. My translation.

Wicked Men and Fools

Robert Louis Stevenson, Kidnapped (London: William Heinemann, 1924; 1886), p. 98:

I have seen wicked men and fools, a great many of both; and I believe they both get paid in the end; but the fools first.