Part IIIaBaptismQuestion 70
Circumcision
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The rite of circumcision in the Old Law was a preparation for baptism, and a figure of baptism. For it was a proclamation of faith by which a man was aggregated to the body ofthe faithful.
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Circumcision was instituted in the person of Abraham who was the first to receive the promise of the birth of Christ as of his seed or line (Gen. 22:18), and was the first to segregatehimself from unbelievers.
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Circumcision was established as a sign of faith; it wasa work of the all-wise God.
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Circumcision remitted original sin and conferred grace as a sign of faith in Christ’s coming Passion. Baptism confersgrace by the power of the sacrament itself as the instrument of Christ’s accomplished Passion.
Full Summa Text · III, Q. 70
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