“The greatest of all mistakes is to do nothing because you think you can only do a little.”
“It is the greatest of all mistakes to do nothing because you can only do little.”
Lecture XIX : On the Conduct of the Understanding, Part II
Elementary Sketches of Moral Philosophy (1849)
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Sydney Smith 68
English writer and clergyman 1771–1845Related quotes

“Nobody made a greater mistake than he who did nothing because he could do only a little.”
Not found in Burke's writings. Appears to be a paraphrase of "It is the greatest of all mistakes to do nothing because you can only do little." sourced to Sydney Smith (1771 - 1845).

“You can do very little with faith, but you can do nothing without it.”
Faith, ii
The Note-Books of Samuel Butler (1912), Part XXI - Rebelliousness
Address to Polaroid employees at Symphony Hall in Boston, Massachusetts (5 February 1960), as quoted in Insisting on the Impossible : The Life of Edwin Land (1998) by Victor K. McElheny, p. 198
Context: The world is a scene changing so rapidly that it takes every bit of intuitive ability you have, every brain cell each one of you has, to make the sensible decision about what to do next. You cannot rely upon what you have been taught. All you have learned from history is old ways of making mistakes. There is nothing that history can tell you about what we must do tomorrow. Only what we must not do.

“It's only those who do nothing that make no mistakes, I suppose.”
Source: An Outcast of the Islands (1896), Pt. 3, Ch. 2; possibly an adaptation of a Polish proverb, "Ten się nie myli, kto nic nie robi" — "One is not wrong, who does nothing."