The Cherubim were placed at the gate of the earthly paradise with their flaming sword, to teach us that no one shall enter into the heavenly paradise who is not pierced through with the sword of love. For this cause, Theotimus, the sweet Jesus who bought us with his blood, is infinitely desirous that we should love him that we may eternally be saved, and desires we may be saved that we may love him eternally, his love tending to our salvation and our salvation to his love.
— St. Francis de Sales, Treatise on the Love of God,
Translated by the Rev. Henry Benedict Mackey, O.S.B., 1910, p. 83-84