You do ill if you praise, but worse if you censure, what you do not understand. - Leonardo da Vinci
Most of our censure of others is only oblique praise of self, uttered to show the wisdom and superiority of the speaker. It has all the insidiousness of self-praise, and all the ill-desert of falsehood.
Ten censure wrong, for one that writes amiss. - Alexander Pope
Mankind censure injustice fearing that they may be the victims of it, and not because they shrink from committing it. - Plato
It is the business of a virtuous clergy to censure vice in every appearance of it. - Patrick Henry
[...] be unaffected by naysayers. Let not your desire or determination be wavered by the censure of cynics, the criticism of pessimists, the undermining of those that belittle, the jeering of the mockers, or the doubts of the skeptics. - Habib Umar