Pallida mors aequo pulsat pede pauperum tabernas regumque turres. - Pale Death kicks in the huts of paupers just as it does the towers of kings, (… - Horace

Absentem qui rodit amicum,
Qui non defendit alio culpante, solutos
Qui captat risus hominum, famamque dicacis;
Fingere qui non visa potest, commissa tacere
Qui nequit, hic niger est, hunc tu, Romane, caveto.

The man who is tenacious of purpose in a rightful cause is not shaken from his firm resolve by the frenzy of his fellow citizens clamoring for what is wrong, or by the tyrant's threatening countenance.

... Siquid tamen olim scripseris, in Maeci descendat iudicis auris et patris et nostras, nonumque prematur in annum membranis intus positis; delere licebit quod non edideris; nescit uox missa reuerti.