“We aim at a target—an end—marked by a point. The arrows go to right and left, high or low, according to the address of the shooters. In the mean time, after a considerable number of trials, the butt, which has not yet been touched, perhaps, a single time, becomes so well pointed out by the marks around it, that they would aid at once in rediscovering it, if it should chance to be lost sight of. Nay, more than this; even aims the most unfortunate may be made to conduce to this end; commencing with those marks which are farthest away, if they be sufficiently numerous, one may learn from them the real position of the point they surround.”

Source: Light on Life: The Yoga Journey to Wholeness, Inner Peace, and Ultimate Freedom, p. 177

Attributed without citation in Ken Robinson, The Element (2009), p. 260. Widely attributed to Michelangelo since the late 1990s, this adage has not been found before 1980 when it appeared without attribution in E. C. McKenzie, Mac's giant book of quips & quotes.
Disputed
Variant: The greatest danger for most of us is not that our aim is too high and we miss it, but that it is too low and we reach it.

Klopp comparing the financial capabilities of Bayern Munich and Borussia Dortmund.
About Bayern Munich

Part 4, 1979 - 1984 "Welcome to the 1980's", p. 340
Memoirs (1993)

Source: In the Harbor

Source: Four Quartets

Source: The Element: How Finding Your Passion Changes Everything