Lighthouses are more useful than churches.

Also quoted as “Lighthouses are more helpful than churches” or “A lighthouse is more useful than a church.” Although not by Franklin in this form, it may be intended as a paraphrase of something he wrote to his wife on 17 July 1757, given in a footnote on page 133 of Memoirs of the Life and Writings of Benjamin Franklin (1818). After describing a narrow escape from shipwreck he added

The bell ringing for church, we went thither immediately, and with hearts full of gratitude, returned sincere thanks to God for the mercies we had received: were I a Roman Catholic, perhaps I should on this occasion vow to build a chapel to some saint, but as I am not, if I were to vow at all, it should be to build a light-house.