Friedrich (Wilhelm) Nietzsche, 1844-1900
was a German philosopher
One must have a good memory to be able to keep the promises one makes.
Robert (Lee) Frost, 1874-1963
was an American poet
The woods are lovely, dark, and deep,But I have promises to keep,And miles to go before I sleep,And miles to go before I sleep.
( Poem “Stopping by Woods on a Snowy Evening”, 1922 )
Thomas Fuller, 1608-1661
was an English clergyman and historian
Thou ought to be nice, even to superstition, in keeping thy promises, and therefore equally cautious in making them.