But sanctify the Lord God in your hearts; and always be ready to give an answer to everyone who asks you a reason concerning the hope that is in you, with humility and fear:
Hope here is by a metonymy to be taken for faith. Peter, however, as it has been said, does not require them to know how to discuss distinctly and refinedly every article of the faith, but only to shew that their faith in Christ was consistent with genuine piety. And hence we learn how all those abuse the name of Christians, who understand nothing certain respecting their faith, and have nothing to give as an answer for it. But it behoves us again carefully to consider what he says, when he speaks of that hope that is in you; for he intimates that the confession which flows from the heart is alone that which is approved by God; for except faith dwells within, the tongue prattles in vain. It ought then to have its roots within us, so that it may afterwards bring forth the fruit of confession. 