“Those who do not speak the words of God with humility must be advised that when they apply medicine to the sick, they must first inspect the poison of their own infection, or else by attempting to heal others, they kill themselves.”
Source: The Book of Pastoral Rule, p.159
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Pope Gregory I 10
Pope from 590 to 604 540–604Related quotes

“In foreign policy, as in medicine, leaders must “first do no harm.””
"Obama the Pragmatist" http://www.project-syndicate.org/commentary/joseph-s--nye-defends-obama-s-approach-to-foreign-policy-against-critics-calling-for-a-more-muscular-approach, Project Syndicate (June 10, 2014).

Cults, Sects and Questions (c. 1979)

On Behalf of the Movement of Nonaligned Countries (1979)

Source: The Flame is Green (1971), Ch. 9 : Oh, The Steep Roofs of Paris
Context: The devils stroll the earth again and infect with the red sickness. They must, at all cost to themselves, destroy the growing tendrils before such can touch the other side. For, whenever one least growing creeper touches across the interval, that means the extinction of a devil. It is a thing to be tested. Notice it that whenever there is the special shrilling, when there is the wild flinging out of catchwords to catch you in, when there are the weird exceptions and inclusions, when there are specious arguments and the murderous defamations, when all the volubility of the voltairians and the cuteness of the queers has been assembled to confound you, then one green growth has almost reached across to the other side, one devil is in danger of extinction. Oh, they will defend against that!

“God's commandment is that those who serve Him must separate themselves from the world.”
Source: Separation from the World, p. 4

“In these times when, to express ourselves, we must speak in a way others do not.”