Ever tried.Ever failed.No matter. Tryagain. Fail again. Fail better.

-Beckett, Samuel
  Worstward Ho.

Holding hands at midnight 'Neath a starry sky, Nice work if you can get it, And you can get it if you try.

-Gershwin, Ira originally Israel Gershowitz
  'Nice Work IfYou Can Get It', song from the musical Damsel in Distress (music by George Gershwin).

Alles Gescheite ist schon gedacht worden; man muss nur versuchen, es noch einmal zu denken. Everything clever has been thought of before.We must try to think it again.

-Goethe,JohannWolfgang von
  Spru«  che in Prosa, Maximen und Reflexionen, pt.1.

If at first you don't succeed, Try, try again.

-Hickson,William Eward
'Try and Try Again'.

Brevis esse laboro, Obscurus fio. I try hard to be succinct, and am merely obscure.

-Horace full name  Quintus Horatius Flaccus   65
Ars Poetica, l.25^6.

   Please don't try to make things nice! All the wrong notes are right† I want it that way.

-Iverson, Allen
c.1914  Note to the copyist of  The Fourth of  July.

I don't hate men, I just wish they'd try harder. Theyall want to be heroes and all we want is for them to stay at home and help with the housework and the kids. That's not the kind of heroism they enjoy.

-Winterson,Jeanette
  Sexing the Cherry.