“I go to the typical state school and try to infiltrate it. Yes!... One can do something in the institutions in trying to infiltrate them, and outside one can do something to set a model in place... One must work with divers methods anyway. One must always carry on with what is possible.”
1970's, Every Man an Artist: Talks at Documenta 5', 1972
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Joseph Beuys 50
German visual artist 1921–1986Related quotes

Lectures XIV and XV, "The Value of Saintliness"
1900s, The Varieties of Religious Experience (1902)

“One must be something in order to do something.”
Conversations with Eckermann (20 October 1828)
p. 1078 of "The discovery of forcing." http://www.logic.univie.ac.at/~ykhomski/ST2013/The%20Discovery%20of%20Forcing.pdf Rocky Mountain Journal of Mathematics 32, no. 4 (2002): 1071–1100.

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: My faith demands - this is not optional - my faith demands that I do whatever I can, wherever I can, whenever I can, for as long as I can with whatever I have to try to make a difference.

From 1980s onwards, Only Integrity is Going to Count (1983)
Context: I never try to tell anybody else what to do, number one. And number two, I think that's what the individual is all about. Each one of us has something to contribute. This really depends on each one doing their own thinking, but not following any kind of rule that I can give out, any command. We're all on the frontier, we're all in a great mystery — incredibly mysterious. Each one possesses exactly what each one is working out, and what each one works out relates to their particular set of circumstances of any one day, or any one place around the world.