The slenderest knowledge that may be obtained of the highest things is more desirable than the most certain knowledge obtained of lesser things.

I receive Thee ransom of my soul. For love of Thee have I studied and kept vigil toiled preached and taught…

Every judgement of conscience, be it right or wrong, be it about things evil in themselves or morally indifferent, is obligatory, in such wise that he who acts against his conscience always sins.

Don't ask who said it? Ask what they said.