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."