Failure to achieve such a competence was in itself proof of a lack of virtue.
出自: R. NiebuhrThe proofs we were offered for the existence of God all seemed to contain serious flaws.
出自: A. KennyThese cuirasses..were not proof against a well-delivered thrust.
出自: C. BoutellIt would do him no harm because he was proof against poison of all kinds.
出自: A. Sillitoe