“Hold faithfulness and sincerity as first principles.”

Confessions Of A Sceptic
The Nemesis of Faith (1849)
Context: It was brought home to me that two men may be as sincere, as earnest, as faithful, as uncompromising, and yet hold opinions far asunder as the poles. I have before said that I think the moment of this conviction is the most perilous crisis of our lives; for myself, it threw me at once on my own responsibility, and obliged me to look for myself at what men said, instead of simply accepting all because they said it. I begin to look about me to listen to what had to be said on many sides of the question, and try, as far as I could, to give it all fair hearing.

Quando non si è sinceri bisogna fingere, a forza di fingere si finisce per credere; questo è il principio di ogni fede.
Source: Gli indifferenti (1929; repr. Milano: Corbaccio, 1974) p. 238; Tami Calliope (trans.) The Time of Indifference (South Royalton, Vt.: Steerforth Press, 2000) p. 207.

Source: Meditations in Wall Street (1940), p. 82

Too Busy Not to Pray (2008, InterVarsity Press)

Source: Break-Out from the Crystal Palace (1974), p. 143

1840s, Heroes and Hero-Worship (1840), The Hero as Prophet

Source: Anarchy, State, and Utopia (1974), Ch. 7 : Distributive Justice, Section I, The Entitlement Theory, p. 151
Context: 1. A person who acquires a holding in accordance with the principle of justice in acquisition is entitled to that holding.
2. A person who acquires a holding in accordance with the principle of justice in transfer, from someone else entitled to the holding, is entitled to the holding.
3. No one is entitled to a holding except by (repeated) applications of 1 and 2.

Intro (2012 edition)
1990s, The Innovator's Dilemma (1997)
Source: How Will You Measure Your Life?