Er, Roger, these deep Thoughts aren't mine -- I just find 'em and type 'em...! Glad for help! My contribution for the day, an oldie but a goodie:

"The Moving Finger writes;
and having writ,
Moves on: nor all thy Piety nor Wit
Shall lure it back to cancel half a line,
Nor all thy Tears wash out a word of it."
--Omar Khayyam, the Ruba'iyat (E. Fitzgerald, trans. and adaptor, if truth be told).