Dost thou love Life? then do not squander Time; for that’s the Stuff Life is made of.

Benjamin Franklin (1706–1790) American statesman, scientist, philosopher, aphorist

Poor Richard (1746 ed.)
    (Source)

Reprinted in Poor Richard Improved (1758 ed.). This edition was Franklin's final Poor Richard, and he had it prefaced (1757-07-07) by a new character, Father Abraham, who combined a hundred aphorisms from previous Poor Richard almanacs. This preface became reprinted and (often abridged) known separately as "The Way to Wealth."