“Tolerance is an attitude of reasoned patience toward evil … a forbearance that restrains us from showing anger or inflicting punishment. Tolerance applies only to persons … never to truth. Tolerance applies to the erring, intolerance to the error … Architects are as intolerant about sand as foundations for skyscrapers as doctors are intolerant about germs in the laboratory. Tolerance does not apply to truth or principles. About these things we must be intolerant, and for this kind of intolerance, so much needed to rouse us from sentimental gush, I make a plea. Intolerance of this kind is the foundation of all stability.”

“America, it is said, is suffering from intolerance — it is not. It is suffering from tolerance. Tolerance of right and wrong, truth and error, virtue and evil, Christ and chaos. Our country is not nearly so overrun with the bigoted as it is overrun with the broadminded.”

“The world may disagree with the Church, but the world knows very definitely with what it is disagreeing. In the future as in the past, the Church will be intolerant about the sanctity of marriage, for what God has joined together no man shall put asunder; she will be intolerant about her creed, and be ready to die for it, for she fears not those who kill the body, but rather those who have the power to cast body and soul into hell.”

“Don't get so tolerant that you tolerate intolerance.”

“Tolerance of intolerance is cowardice.”

“The liberal idea of tolerance is more and more a kind of intolerance. What it means is 'Leave me alone; don't harass me; I'm intolerant towards your over-proximity.”

“Involuntary organizations ought to be tolerant, but voluntary organizations, so far as the fundamental purpose of their existence is concerned, must be intolerant or else cease to exist.”