Your reason is now mature enough to examine this object. In the first place divest yourself of all bias in favour of novelty & singularity of opinion. Indulge them in any other subject rather than that of religion. It is too important, & the consequences of error may be too serious. On the other hand shake off all the fears & servile prejudices under which weak minds are servilely crouched. Fix reason firmly in her seat, and call to her tribunal every fact, every opinion. Question with boldness even the existence of a god; because, if there be one, he must more approve of the homage of reason, than that of blindfolded fear. You will naturally examine first the religion of your own country. Read the bible then, as you would read Livy or Tacitus. The facts which are within the ordinary course of nature you will believe on the authority of the writer, as you do those of the same kind in Livy & Tacitus. The testimony of the writer weighs in their favor in one scale, and their not being against the laws of nature does not weigh against them. But those facts in the bible which contradict the laws of nature, must be examined with more care, and under a variety of faces. Here you must recur to the pretensions of the writer to inspiration from god. Examine upon what evidence his pretensions are founded, and whether that evidence is so strong as that its falsehood would be more improbable than a change in the laws of nature in the case he relates.
The source I cite does not capitalize “god,” but those who cite this quote often capitalize the “G,” as in “God” — despite the subject matter of the quote, whose unflinching rationalism is considering the question of even the existence of a capital-G “God.”
Thomas Jefferson remains a hero of mine.