Of all the horrid, hideous notes of woe,
Sadder than owl songs or the midnight blast,
Is that portentous phrase, “I told you so,”
Utter’d by friends, those prophets of the past,
Who, ‘stead of saying what you now should do,
Own they foresaw that you would fall at last.

George Gordon, Lord Byron (1788-1824) English poet

Don Juan, Canto 14, st. 50 (1823)
    (Source)