“And I know I can do this because I went to London on my own, and because I solved the mystery…and I was brave and I wrote a book and that means I can do anything.”

Autobiography (1936; 1949; 1958)
Context: What the mysterious is I do not know. I do not call it God because God has come to mean much that I do not believe in. I find myself incapable of thinking of a deity or of any unknown supreme power in anthropomorphic terms, and the fact that many people think so is continually a source of surprise to me. Any idea of a personal God seems very odd to me.
Intellectually, I can appreciate to some extent the conception of monism, and I have been attracted towards the Advaita (non-dualist) philosophy of the Vedanta, though I do not presume to understand it in all its depth and intricacy, and I realise that merely an intellectual appreciation of such matters does not carry one far. <!-- p. 16 (1946)

Mister Lowry- interview Tyne Tees Television 1968 L. S. Lowry - A Biography by Shelley Rhode Lowry Press 1999 ISBN 9781902970011.
Tynes Tees Television Interview 1968

Source: Finite and Infinite Games: A Vision of Life as Play and Possibility

The TB12 Method (2017) p. 73

Music America Interview

Source: The Princess Bride

Edward Everett Hale in a statement published in A Year of Beautiful Thoughts‎ (1902) by Jeanie Ashley Bates Greenough, p. 172; <!-- and perhaps as early as an edition of Ten Times One is Ten (1870) by Hale--> This has been misattributed to Keller in published works since at least 1980. Keller and Hale were good friends, and letters to Hale can be found in her youthful autobiography The Story of My Life (1902). In 1910 Keller dedicated her poem "The Song of the Stone Wall" to Hale who had died in 1909.
Misattributed
Variant: I am only one, but I am one. I can not do everything, but I can do something. I must not fail to do the something that I can do.

Statement published in A Year of Beautiful Thoughts‎ (1902) by Jeanie Ashley Bates Greenough, p. 172, Third statement for June 11. This has often been misattributed to Helen Keller in some published works since at least 1980, perhaps because she somewhere quoted it.
Variant:
I am only one,
But still I am one.
I cannot do everything,
But still I can do something;
And because I cannot do everything,
I will not refuse to do the something that I can do.
The Book of Good Cheer : A Little Bundle of Cheery Thoughts‎ (1909) by Edwin Osgood Grover, p. 28; also in Masterpieces of Religious Verse (1948) by James Dalton Morrison, p. 416, where it is titled "Lend a Hand"
Variant: I am only one, but still I am one. I cannot do everything, but still I can do something; and because I cannot do everything, I will not refuse to do something that I can do.