Anton Chekhov
Despite your best efforts, you could not invent a better police force for literature than criticism and the author’s own conscience.

Anton Chekhov
Isolation in creative work is an onerous thing. Better to have negative criticism than nothing at all.

Anton Chekhov
Ordinary hypocrites pretend to be doves; political and literary hypocrites pretend to be eagles. But don't be disconcerted by their aquiline appearance. They are not eagles, but rats or dogs.

Dale Carnegie
Any fool can criticize, condemn and complain - and most fools do. But it takes character and self-control to be understanding and forgiving.

Gilbert K. Chesterton
What embitters the world is not excess of criticism, but absence of self-criticism.

James A Baldwin
 I love America more than any other country in the world, and, exactly for this reason, I insist on the right to criticize her perpetually.

Jean de la Bruyere
The pleasure of criticism takes away from us the pleasure of being deeply moved by very fine things

Mary Kay Ash Quote - Criticize the act, not the person. -
Mary Kay Ash
Criticize the act, not the person.

Mary Kay Ash
Sandwich every bit of criticism between two layers of praise.

Miguel de Cervantes
Let each man say what he chooses; if because of this I am criticized by the ignorant, I shall not be chastised by the learned.