The gods of the valley are not the gods of the hills, and you shall understand it.
Those who invalidate reason ought seriously to consider whether they argue against reason with or without reason.
While we are under the tyranny of Priests, it will ever be their interest, to invalidate the law of nature and reason, in order to establish systems incompatible therewith.
In those parts of the world where learning and science has prevailed, miracles have ceased; but in those parts of it as are barbarous and ignorant, miracles are still in vogue.
Undoubtedly it is our duty, and for our best good, that we occupy and improve the faculties, with which our creator has endowed us, but so far as prejudice, or prepossession of opinion prevails over our minds, in the same proportion, reason is excluded from our theory or practice. Therefore if we would acquire useful knowledge, we must first divest ourselves of those impediments and sincerely endeavor to search out the truth: and draw our conclusions from reason and just argument, which will never conform to our inclination, interest or fancy but we must conform to that if we would judge rightly.
Though "none by searching can find out God, or the Almighty to perfection," yet I am persuaded, that if mankind would dare to exercise their reason as freely on those divine topics as they do in the common concerns of life, they would, in a great measure, rid themselves of their blindness and superstition, gain more exalted ideas of God and their obligations to him and one another, and be proportionally delighted and blessed with the views of his moral government, make better members of society, and acquire, manly powerful incentives to the practice of morality, which is the last and greatest perfection that human nature is capable of.