“Human minds are more full of mysteries than any written book and more changeable than the cloud shapes in the air.”

The Pathway of Life: Teaching Love and Wisdom (posthumous), Part I, International Book Publishing Company, New York, 1919, p. 68

Sermons, From Our Daily Bread

'Modus Vivendi' (p.34)
Gray's Anatomy: Selected Writings (2009)

The trial of Charles B. Reynolds for blasphemy (1887)
Context: Gentlemen, you can never make me believe — no statute can ever convince me, that there is any infinite Being in this universe who hates an honest man. It is impossible to satisfy me that there is any God, or can be any God, who holds in abhorrence a soul that has the courage to express his thought. Neither can the whole world convince me that any man should be punished, either in this world or in the next, for being candid with his fellow-men. If you send men to the penitentiary for speaking their thoughts, for endeavoring to enlighten their fellows, then the penitentiary will become a place of honor, and the victim will step from it — not stained, not disgraced, but clad in robes of glory.
Let us take one more step.
What is holy, what is sacred? I reply that human happiness is holy, human rights are holy. The body and soul of man — these are sacred. The liberty of man is of far more importance than any book; the rights of man, more sacred than any religion — than any Scriptures, whether inspired or not.
What we want is the truth, and does any one suppose that all of the truth is confined in one book — that the mysteries of the whole world are explained by one volume?
All that is — all that conveys information to man — all that has been produced by the past — all that now exists — should be considered by an intelligent man. All the known truths of this world — all the philosophy, all the poems, all the pictures, all the statues, all the entrancing music — the prattle of babes, the lullaby of mothers, the words of honest men, the trumpet calls to duty — all these make up the bible of the world — everything that is noble and true and free, you will find in this great book.
If we wish to be true to ourselves, — if we wish to benefit our fellow-men — if we wish to live honorable lives — we will give to every other human being every right that we claim for ourselves.

As quoted in The 101 Habits of Highly Successful Screenwriters: Insiders Secrets from Hollywood's Top Writers (2001) by Karl Inglesias, p. 4. This has also appeared on the internet in several slightly paraphrased forms.
Context: The truly creative mind in any field is no more than this: a human creature born abnormally, inhumanly sensitive. To him, a touch is a blow, a sound is a noise, a misfortune is a tragedy, a joy is an ecstasy, a friend is a lover, a lover is a god, and failure is death. Add to this cruelly delicate organism the overpowering necessity to create, create, create — so that without the creating of music or poetry or books or buildings or something of meaning, his very breath is cut off from him. He must create, must pour out creation. By some strange, unknown, inward urgency he is not really alive unless he is creating.

As quoted in Topoi : The Categorial Analysis of Logic (1979) by Robert Goldblatt, p. 13

Fearless Death: Buddhist Wisdom on the Art of Dying (2012)

Source: House Rules