Now he that has made us for the same thing is God, who also has given unto us the earnest of the Spirit.
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Augustine of Hippo
AD 430
For this period in God’s plan, in which the Lord has deigned to appear in time and visibly as a man and has given to us as a pledge the Holy Spirit, by whose sevenfold working we are given life (apostolic authority having been added like the seasoning of a few fish), what else therefore does this period in God’s plan effect but the possibility of attaining the prize of the heavenly calling without [our] powers failing us? “For we walk by faith and not by sight.”