“No man knows fully what has shaped his own thinking”

Source: The High King

II, st. 1
The Winding Stair and Other Poems (1933), A Dialogue of Self and Soul http://poetry.poetryx.com/poems/1397/
Context: What matter if I live it all once more?
Endure that toil of growing up;
The ignominy of boyhood; the distress
Of boyhood changing into man;
The unfinished man and his pain
Brought face to face with his own clumsiness;
The finished man among his enemies?—
How in the name of Heaven can he escape
That defiling and disfigured shape
The mirror of malicious eyes
Casts upon his eyes until at last
He thinks that shape must be his shape?

Hagakure (c. 1716)
Context: A certain swordsman in his declining years said the following: In one's life. there are levels in the pursuit of study. In the lowest level, a person studies but nothing comes of it, and he feels that both he and others are unskillful. At this point he is worthless. In the middle level he is still useless but is aware of his own insufficiencies and can also see the insufficiencies of others. In a higher level he has pride concerning his own ability, rejoices in praise from others, and laments the lack of ability in his fellows. This man has worth. In the highest level a man has the look of knowing nothing. These are the levels in general;. But there is one transcending level, and this is the most excellent of all. This person is aware of the endlessness of entering deeply into a certain Way and never thinks of himself as having finished. He truly knows his own insufficiencies and never in his whole life thinks that he has succeeded. He has no thoughts of pride but with self-abasement knows the Way to the end. It is said that Master Yagyu once remarked, "I do not know the way to defeat others, but the way to defeat myself." Throughout your life advance daily, becoming more skillful than yesterday, more skillful than today. This is never-ending.

Berkeley Peerage Case (1811), 4 Camp. 405.

The Brothers Karamazov (1879–1880)

Source: Thus Spake Zarathustra: A Book for All and None

An Affair with Grouse (1982)

Deming Headlight (New Mexico), 6 January 1950, as cited in the Yale Book of Modern Proverbs and at There Are Opinions, And Then There Are Facts; Freakonomics blog post by Fred R. Shapiro http://www.freakonomics.com/2011/08/18/there-are-opinions-and-then-there-are-facts/ (18 August 2011)

Hindu Sepoy in France
Epitaphs of the War (1914-1918) (1918)