Gregory of Nazianzus, on Ps 50:17

“O Lord, thou wilt open my lips: and my mouth shall declare thy praise.”

“I have not yet alluded to the true and first wisdom, for which our wonderful husbandman and shepherd is conspicuous. The first wisdom is a life worthy of praise, in which a person keeps himself pure for God or is purified for him who is all-pure and all-luminous. God demands of us, as his only sacrifice, purification—that is, a contrite heart, the sacrifice of praise, a new creation in Christ, the new man, and the like, as the Scripture loves to call it.”

Imported from an open dataset — not yet checked against the printed edition.