“[They] revealed to me the most important truth concerning human life. Which is that a shared, a loyal, love between two people is the most beautiful, the most numinous, the most valuable thing of all.”

As quoted in Wisdom for the Soul : Five Millennia of Prescriptions for Spiritual Healing (2006) by Larry Chang, p. 597

Source: Brida

Pudd'nhead Wilson's New Calendar, Ch. VII
Following the Equator (1897)

Source: Principles of Economics, (1890), p. 468 (9th ed. 2009).
Context: If we compare one country of the civilized world with another, or one part of England with another, or one trade in England with another, we find that the degradation of the working-classes varies almost uniformly with the amount of rough work done by women. The most valuable of all capital is that invested in human beings; and of that capital the most precious part is the result of the care and influence of the mother, so long as she retains her tender and unselfish instincts, and has not been hardened by the strain and stress of unfeminine work.

Source: Persecution and the Art of Writing (1952), Persecution and the Art of Writing, p. 36

This means ‘Artistic Integrity’ to me.
Talkings about Chopin and Schumann

Source: The Purpose Driven Life: What on Earth Am I Here for?

Said to portrait painter Samuel Johnson Woolf, cited in Here am I (1941), Samuel Johnson Woolf; this has often been abbreviated: Most writers regard truth as their most valuable possession, and therefore are most economical in its use.

Said to portrait painter Samuel Johnson Woolf, cited in Here am I (1941), Samuel Johnson Woolf; this has often been abbreviated: Most writers regard truth as their most valuable possession, and therefore are most economical in its use.
Context: A critic never made or killed a book or a play. The people themselves are the final judges. It is their opinion that counts. After all, the final test is truth. But the trouble is that most writers regard truth as their most valuable possession and therefore are most economical in its use.