“Regrets are idle; yet history is one long regret. Everything might have turned out so differently!”

Variant: I knew my father had done the best he could, and I had no regrets about the way I'd turned out. Regrets about journey, maybe, but not the destination.
Source: Dear John

Source: Station Eleven (2014), Chapter 53 (p. 327)

Source: The Little Shop of Happy Ever After

Source: The Best of Me

Remarks on The Birth of a Nation attributed to Wilson by writer Thomas Dixon, after White House screening of the film, which was based on Dixon's The Clansman. Wilson later said that he disapproved of the "unfortunate film." Wilson aide Joseph Tumulty, in a letter to the Boston branch of the NAACP in response to reports of Wilson's regard for the film wrote: The President was entirely unaware of the nature of the play before it was presented and at no time has expressed his approbation of it.
Misattributed

Source: Selected Poems

Part I, p. 37
Watt (1943)
Context: Personally of course I regret everything. Not a word, not a deed, not a thought, not a need, not a grief, not a joy, not a girl, not a boy, not a doubt, not a trust, not a scorn, not a lust, not a hope, not a fear, not a smile, not a tear, not a name, not a face, no time, no place, that I do not regret, exceedingly. An ordure, from beginning to end.

Ibid., p. 50
The Book of Disquiet
Original: Um tédio que inclui a antecipação só de mais tédio; a pena, já, de amanhã ter pena de ter tido pena hoje.