From Cyril of Jerusalem, in his lectures to persons preparing for baptism:
Great is the Baptism that lies before you: a ransom to captives; a remission of offences; a death of sin; a new-birth of the soul; a garment of light; a holy indissoluble seal; a chariot to heaven; the delight of Paradise; a welcome into the kingdom; the gift of adoption! But there is a serpent by the wayside watching those who pass by: beware lest he bite thee with unbelief. He sees so many receiving salvation, and is seeking whom he may devour. Thou art coming in unto the Father of Spirits, but thou art going past that serpent.