“How can you reach the womb of the Abyss to make it fruitful? This cannot be expressed, cannot be narrowed into words, cannot be subjected to laws; every man is completely free and has his own special liberation.”

Narada Bhakti Sutras (2001)
Context: A million words cannot express what a glance can convey, and a million glances cannot express what a moment of silence can. A moment of silence conveys so much more than any other expression. Still, love is beyond silence too. You can describe silence to some extent, but that which is beyond silence cannot be expressed. You give, you hug... but still something remains unexpressed.

Source: This and That and the Other (1912), Ch. XXXII : The Barbarians , p. 282
Context: In a word, the Barbarian is discoverable everywhere in this that he cannot make; that he can befog or destroy, but that he cannot sustain; and of every Barbarian in the decline or peril of every civilisation exactly that has been true.
We sit by and watch the Barbarian, we tolerate him; in the long stretches of peace we are not afraid.
We are tickled by his irreverence, his comic inversion of our old certitudes and our fixed creeds refreshes us: we laugh. But as we laugh we are watched by large and awful faces from beyond: and on these faces there is no smile.

Un Art de Vivre (The Art of Living) (1939), The Art of Thinking

"On Freedom" (1940), p. 13 http://books.google.com/books?id=Q1UxYzuI2oQC&lpg=PP1&pg=PA13#v=onepage&q&f=false
1950s, Out of My Later Years (1950)
Context: This freedom of communication is indispensable for the development and extension of scientific knowledge, a consideration of much practical import. In the first instance it must be guaranteed by law. But laws alone cannot secure freedom of expression; in order that every man may present his views without penalty there must be a spirit of tolerance in the entire population. Such an ideal of external liberty can never be fully attained but must be sought unremittingly if scientific thought, and philosophical and creative thinking in general, are to be advanced as far as possible.

Occasionally attributed to Walters; actually written by Mark Twain in What Is Man? and other essays (1917), p. 17.
Misattributed

Source: Middlemarch

"A Free Inquiry into the Vulgar Notion of Nature" Sect.1 ibid.

Address to the Tenth National Women's Rights Convention on Marriage and Divorce, New York City, May 11, 1860; as published in Elizabeth Cady Stanton, Feminist as Thinker: A Reader in Documents and Essays edited by Ellen Carol DuBois and Richard Cándida Smith.