Let us now inquire how our works please God: for no one is ever found to be pure and perfect, as the most perfect are defiled with some vices; so that their works are always sprinkled with some spots and blemishes, and contract some uncleanness from the hidden filth of their hearts. In answer to this, I say first, that all our works are corrupt before God and abominable in his sight, for the heart is naturally corrupt: but when God purifies our hearts by faith, then our works begin to be approved, and obtain praise before him; for the heart is cleansed by faith, and purity is diffused over our works, so that they begin to be pleasing to God. For this reason Moses says, that Abel pleased God with his sacrifices,