Reason spoiled, marred, or robbed of its perfection, ceaseth to be rational, and should not be called reason; inasmuch as it is premised to be deprav… - Ethan Allen

Those who invalidate reason, ought seriously to consider, 'whether they argue against reason, with or without reason; if with reason, then they establish the principle, that they are laboring to dethrone;' but if they argue without reason, (which, in order to be consistent with themselves, they must do,) they are out of the reach of rational conviction, nor do they deserve a rational argument.

The author of human nature impressed it with certain sensitive aptitudes and mental powers, so that apprehension, reflection or understanding could no otherwise be exerted or produced in the compound nature of man, but in the order prescribed by the creator.

Such people as can be prevailed upon to believe, that their reason is depraved, may easily be led by the nose, and duped into superstition at the pleasure of those in whom they confide, and there remain from generation to generation: for when they throw by the law of reason the only one which God gave them to direct them in their speculations and duty, they are exposed to ignorant or insidious teachers, and also to their own irregular passions, and to the folly and enthusiasm of those about them, which nothing but reason can prevent or restrain...

Certain it is, that any supposed obstructions, concerning the quality or temperature of any or every one of those worlds, could not have been any bar in the way of God Almighty, with regard to his replenishing his universal creation with moral agents. The unlimited perfection of God could perfectly well adapt every part of his creation to the design of whatever rank or species of constituted beings, his Godlike wisdom and goodness saw fit to impart existence to; so that as there is no deficiency of absolute perfection in God, it is rationally demonstrative that the immense creation is replenished with rational agents, and that it has been eternally so, and that the display of divine goodness must have been as perfect and complete, in the antecedent, as it is possible to be in the subsequent eternity.