“We must never throw away a bushel of truth because it happens to contain a few grains of chaff.”

"The Flashing Dragonfly" (1973)
Context: Whoever the kid had been, whoever had the grand attitude, has finally heeded the admonishment of parents, teachers, governments, religions, and the law: "You just change your attitude now please, young man." This transformation in kids — from flashing dragonflies, so to say, to sticky water-surface worms slowly slipping downstream — is noticed with pride by society and with mortification by God, which is a fantastic way of saying I don't like to see kids throw away their truth just because it isn't worth a dime in the open market.

http://www.nuklearpower.com/daily.php?date=050927

Source: undated quotes, Tàpies, Werke auf Papier 1943 – 2003,' (2004), p. 30.

Manuscript Found in Accra (2012), Uselessness

Source: Resurrection: Myth or Reality? (1994), p. 37

Orthodoxy (1884)

A part of this passage appeared in The Best Loved Poems of the American People (1936) with the title "Friendship":
A Life for a Life (1859)
Context: Thus ended our little talk: yet it left a pleasant impression. True, the subject was strange enough; my sisters might have been shocked at it; and at my freedom in asking and giving opinions. But oh! the blessing it is to have a friend to whom one can speak fearlessly on any subject; with whom one's deepest as well as one's most foolish thoughts come out simply and safely. Oh, the comfort — the inexpressible comfort of feeling safe with a person — having neither to weigh thoughts nor measure words, but pouring them all right out, just as they are, chaff and grain together; certain that a faithful hand will take and sift them, keep what is worth keeping, and then with the breath of kindness blow the rest away.
Somebody must have done a good deal of the winnowing business this afternoon; for in the course of it I gave him as much nonsense as any reasonable man could stand...

Thiis was published without credit in The Best Loved Poems of the American People (1936) with the title "Friendship", and since that time has sometimes been misattributed http://www.geonius.com/eliot/quotes.html to Eliot; it is actually an adaptation of lines by Dinah Craik, in A Life for a Life (1859):
Oh, the comfort — the inexpressible comfort of feeling safe with a person — having neither to weigh thoughts nor measure words, but pouring them all right out, just as they are, chaff and grain together; certain that a faithful hand will take and sift them, keep what is worth keeping, and then with the breath of kindness blow the rest away.
Misattributed

Robert Elsmere. Book vi. Chap. xxxviii, reported in Bartlett's Familiar Quotations, 10th ed. (1919).