Source, in full
The quote, and its many variants, has been widely attributed to Franklin; however, there has never been an authoritative source for the quote, and research indicates that it is very likely a misquotation of Franklin's words regarding wine: "Behold the rain which descends from heaven upon our vineyards; there it enters the roots of the vines, to be changed into wine; a constant proof that God loves us, and loves to see us happy." (see sourced section above for a more extensive quotation of this passage from a letter to André Morellet), written in 1779.