“Habit with him was all the test of truth,
It must be right: I’ve done it from my youth.”
The Borough (1810), Letter iii, "The Vicar", line 138.
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George Crabbe 20
English poet, surgeon, and clergyman 1754–1832Related quotes

Source: All That Matters (1922), p.30 - The Boy's Ideal, final stanza.

You Can't Let the Boy Overpower) The Man in You (1964
Song lyrics, With The Miracles

“Comfort” is no test of truth; on the contrary, truth is often far from being “comfortable.”
Pearls of Wisdom

Miscellaneous http://books.google.com/books?id=cvlOAAAAMAAJ&q=%22Everyone+sits+in+the+prison+of+his+own+ideas+he+must+burst+it+open+and+that+in+his+youth+and+so+try+to+test+his+ideas+on+reality%22&pg=PA104#v=onepage, Cosmic Religion, p. 104 (1931)
1930s

"The Laws of Science and the Laws of Ethics" (1950)
1950s, Out of My Later Years (1950)

The Confession (c. 452?)
Context: So I hope that I did as I ought, but I do not trust myself as long as I am in this mortal body, for he is strong who strives daily to turn me away from the faith and true holiness to which I aspire until the end of my life for Christ my Lord, but the hostile flesh is always dragging one down to death, that is, to unlawful attractions. And I know in part why I did not lead a perfect life like other believers, but I confess to my Lord and do not blush in his sight, because I am not lying; from the time when I came to know him in my youth, the love of God and fear of him increased in me, and right up until now, by God's favour, I have kept the faith.

“For the habit of arguing in support of atheism, whether it be done from conviction or in pretence, is a wicked and impious practice.”
Mala enim et impia consuetudo est contra deos disputandi, sive ex animo id fit sive simulate.
Book II, section 67
De Natura Deorum – On the Nature of the Gods (45 BC)