For with the heart man believes unto righteousness; and with the mouth confession is made unto salvation.
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Augustine of Hippo
AD 430
We who expect to reign in everlasting righteousness can only be saved from this wicked world if while for our neighbor’s salvation we profess with our lips the faith which we carry about in our heart, we exercise a pious and careful vigilance to see that this faith in us is not sullied in any point of belief by the deceitful snares of heretics.