“ Thoughts come into our minds by avenues which we never left open, and thoughts go out of our minds through avenues which we never voluntarily opened. ”
 Ralph Waldo Emerson, The Over-Soul (1841). copy citation

add

“By virtue of this inevitable nature, private will is overpowered, and, maugre our efforts or our imperfections, your genius will speak from you, and mine from me. That which we are, we shall teach, not voluntarily, but involuntarily. Thoughts come into our minds by avenues which we never left open, and thoughts go out of our minds through avenues which we never voluntarily opened. Character teaches over our head. The infallible index of true progress is found in the tone the man takes. Neither his age, nor his breeding, nor company, nor books, nor actions, nor talents, nor all together, can hinder him from being deferential to a higher spirit than his own.” source