“Man's greatness consists in his ability to do and the proper application of his powers to things needed to be done.”

Source: Reveries of the Solitary Walker

Part 1.3 Rights of Man
1790s, Rights of Man, Part I (1791)

The Criticism of the Gotha Program (1875)
Variant: Variant translation: From each according to his ability, to each according to his need.

Source: The Prince

Letter to "Micheal" (16 February 1970), Micheal was a 10 year old boy who had inquired in a letter as to whether Fuller was a "doer" or a "thinker".
1970s
Context: The Things to do are: the things that need doing, that you see need to be done, and that no one else seems to see need to be done. Then you will conceive your own way of doing that which needs to be done — that no one else has told you to do or how to do it. This will bring out the real you that often gets buried inside a character that has acquired a superficial array of behaviors induced or imposed by others on the individual.

"Only Women Bleed" (co-written with Dick Wagner) - Lyrics online http://www.songfacts.com/detail.php?id=3929.
Welcome to My Nightmare (1975)
Context: Man's got his woman to take his seed
He's got the power — oh
She's got the need
She spends her life through pleasing up her man
She feeds him dinner or anything she can.
She cries alone at night too often
He smokes and drinks and don't come home at all.
Only women bleed...