Nominated for quote of the week, which I encountered while reading Matt Ridley’s The Rational Optimist:

He who receives an idea from me, receives instruction himself without lessening mine; as he who lights his taper at mine, receives light without darkening me.

Thomas Jefferson (April 13, 1743—July 4, 1826), American Founding Father and the principal author of the Declaration of Independence (1776)
in a letter to Isaac McPherson