Hitherto I have been under the guidance of that portion of reason which He has thought proper to deal out to me. I have followed it faithfully in all important cases, to such a degree at least as leaves me without uneasiness; and if on minor occasions I have erred from its dictates, I have trust in Him who made us what we are, and knows it was not His plan to make us always unerring.

Thomas Jefferson (1743–1826) American political philosopher, polymath, statesman, US President (1801–09)

Letter (1814-09-26) to Miles King
    (Source)