“Anything done against faith or conscience is sinful.”

Albert Einstein, as quoted by Virgil Henshaw in Albert Einstein: Philosopher Scientist (1949) edited by Paul A. Schilpp
1940s
Variant: Never do anything against conscience even if the state demands it.

Source: The Sayings and Teachings of the Great Mystics of Islam (2004), p. 29

Medea, lines 500-501; (Medea)
Alternate translation: He who profits by crime commits it. (translator unknown).
Tragedies

Featherisms (2008)

Source: The Cost of Discipleship

Aaron Judge's Twitter Page https://twitter.com/thejudge44?lang=en

Source: Swoon

The Tragic Sense of Life (1913), IV : The Essence of Catholicism
Context: The real sin — perhaps it is a sin against the Holy Ghost for which there is no remission — is the sin of heresy, the sin of thinking for oneself. The saying has been heard before now, here in Spain, that to be a liberal — that is, a heretic — is worse than being an assassin, a thief, or an adulterer. The gravest sin is not to obey the Church, whose infallibility protects us from reason.

A. Outler, trans. (Dover: 2002), Book 5, Chapter 10, p. 77
Confessions (c. 397)