The thing that hath been, it is that which shall be; and that which is done is that which shall be done: and there is no new thing under the sun.

-Bible (Old Testament)
Ecclesiastes1:9.

Done because we are too menny.

-Hardy,Thomas
   The note left by  Jude's young son, who had hanged his siblings and himself.  Jude the Obscure, pt.6, ch.2.

Non enim rei effectus, sed efficientis affectus in crimine est. Nec qu× fiunt, sed quo animo fiunt, ×quitus pensat. Crime liesnot inthe deed, but inthe doer'sintention: it is not what was done, but the spirit in which it was done that justice should consider.

-He¤  lo|«  se
c.1135  First letter to Peter  Abelard.

What have I done for you, England, my England?

-Henley,W(illiam) E(rnest)
  'Pro Rege Nostro'.

You learn to love by lovingöby paying attention and doing what one thereby discovers has to be done.

-Huxley, Aldous Leonard
  Time Must Have a Stop.

He has, indeed, done it very well; but it is a foolish thing well done.

-Johnson, Samuel known as Dr Johnson
  Of Oliver Goldsmith, who had responded to Thomas Evans's uncomplimentary open letter with a physical assault, and then published an apology in the London Chronicle. Remark, 3  Apr. Collected in  James Boswell The Life of Samuel Johnson (1791), vol.2.

Love only what you do, And not what you have done.

-Rich, Adrienne Cecile
  The Diamond Cutters and Other Poems,'The Diamond Cutters'.

The consumer, so it is said, is the king†each is a voter who uses his money as votes to get the things done that he wants done.

-Samuelson, Paul Anthony
  Economics.

   I never made a mistake in grammar but once in my life and as soon as I done it I seen it.

-Sandburg, Carl
  The People,Yes.

When all is said and done, leading a good life is more important than keeping a good diary.

-Sassoon, Siegfried Louvain
  Diary entry, 8 Jul.

  So much has been done, exclaimed the soul of Frankensteinömore, far more, will I achieve; treading the steps already marked, I will pioneer a new way, explore unknown powers, and unfold to the world the deepest mysteries of creation.

-Shelley, Mary Godwin
  Frankenstein, ch.3.

Come, gie's a sang, Montgomery cry'd, And lay your disputes a'aside; What signifies't for folks to chide For what's been done before them? Let Whig and Torya'agree, Whig and Tory,Whig and Tory, Whig and Tory a'agree To drop their whigmigmorum; Let Whig and Torya'agree To spend this night wi'mirth and glee, And cheerfu'sing, alang wi'me, The Reel o' Tullochgorum.

-Skinner,John
'Tullochgorum', stanza1.

Men, my brothers, men the workers, ever reaping something new: That which they have done but earnest of the things that they shall do: For I dipped into the future, far as human eye could see, Saw the vision of the world, and all the wonder that would be; Saw the heaven fill with commerce, argosies of magic sails, Pilots of the purple twilight, dropping down with costly bales; Heard the heavens fill with shouting, and there rained a ghastly dew From the nations'airy navies grappling in the central blue; Far along the world-wide whisper of the south-wind rushing warm, Ulysses With the standards of the peoples plunging through the thunder-storm; Till the war-drum throbbed no longer, and the battle- flags were furled In the Parliament of man, the Federation of the world.

-Tennyson
  Poems,'Locksley Hall', l.117^28.