The Circumcision of the Lord and Savior Jesus Christ
A new year, a new life! A new life indeed! - for if we circumcise in ourselves the old man... corrupted according to the desire of error (Eph. 4.22) with his vices and passions, the "Christian" can grow in us; we can become new creatures, purified by the Blood of Christ, vivified and nourished by His grace through the Holy Eucharist, so that it may no longer be we who live, but Christ liveth in [us] (Gal. 2.2). The new year which begins today will acquire value only if lived in this light. Only by this daily circumcision of the heart will grace triumph in us, thus making the Christ-life an ever-increasing reality in us.
Jesus' humble submission to His Father's will, manifested by His obedience to the law*, is another lesson to be learned from today's Feast.
* The law of circumcision, cf. Gen. 17.12-13, could in no way affect Jesus Christ, the Son of God and the Holy One (Acts 3.15; Is. 43.3), but He willed to submit to it for as St. Paul says, it behooved Him in all things to be made like unto His brethren... that He might be a propitiation for the sins of the people (Heb. 2.17).
It is an invitation to us to be docile to God's will, whatever it may be - Our Lord's disposition: my meat is to do the will of Him that sent Me (Jn. 4.34). None of us knows what awaits us in this new year, but God knows. His will has already prepared our path; every detail of our life is already determined in His mind. Let us be ready to accept, or rather to embrace with courage and readiness, everything that God wishes or permits, certain that in His holy will we shall find our peace, our salvation, and our sanctification.
A blessed new year to all!
Related post: Why does the Catholic Church baptize infants? Cf., "Circumcision and the Catholic Infant Baptism"