From “Lincoln 365,” by Arnold Kunst:
Lincoln had a voracious curiosity. Since he had virtually no formal schooling he learned early in life that satisfying his curiosity was going to be his job and his job alone. Consequently, as a child he taught himself to read and write; he also taught himself Euclidean geometry, then surveying, then the law. He was a lifelong student of literature having memorized long passages from both Shakespeare and the Bible. As if all that were not enough, in 1849 he applied for a patent on his design for ‘a new and improved manner of combining adjustable buoyant chambers with steam boats’ [these chambers were designed to lift steam boats above sand bars]. He is the only president in American history to have been granted a patent. Then as President he taught himself how to be a Commander in Chief.
‘Never does nature say one thing and wisdom another.’