Time's fatal wings do ever forward fly;
To every day we live, a day we die.
Time Quotes
The sourced entries here are an odd mix: Edmund Burke on planning the future by the past (1791), Rollo May on learning to live in the present (1953), and a line about death from Vonnegut’s Slaughterhouse-Five (1969) that turns up on several pages because it fits more than one. Shakespeare leads the page by a wide margin, with T. S. Eliot a distant second.
“Time flies like an arrow; fruit flies like a banana” is credited to Groucho Marx almost everywhere and is flagged. No citation to Marx has been found. It first appears in the mid-1960s, unattributed, in logic and computing texts, as an example of why machines find ordinary sentences hard to parse.
See Time has touched me gently in his race,
And left no odious furrows in my face.
To the true teacher, time's hour-glass should still run gold-dust.
We feel and experience ourselves to be eternal. (Latin: "Sentimus experimurque nos æternos esse.")
For the things seen are temporary, but the things unseen are everlasting.
There's no need to reminisce about the past; obviously because that shit did not last.
The bell strikes one. We take no note of time
But from its loss.