Today is the feast of Epiphany

One feature of Mission St. Claire's Daily Office site (that presents each day's prayer service from the Book of Common Prayer) is a brief explanation of the traditional Church Calendar. (A wise friend once noted that, if we ignore the Church calendar, we will fall back to the Hallmark calendar. Only too true...).
Today is Epiphany. Here, from St. Claire's site, is an explanation.

On this day we celebrate the holy Epiphany of our Lord and God and Savior
Jesus Christ.
In all the holy churches of God we celebrate today the holy
Epiphany of our Lord and God and Savior Jesus Christ and from evening onwards we
keep a vigil because when the Lord completed His thirtieth year on earth He
wanted to make Himself known to people that He is God in body. When the Lord was
being baptized by John, he was revealed in voice by God the Father from above
and by the coming of the Holy Spirit to be true God and consubstantial with the
Father. From that time onwards it was made known to all through miracles and His
excellent teaching that He certainly is the God who was openly preached by the
prophets.
He came to baptism for such a reason: When the Lord became man for
us, he fulfilled the whole law throughout His whole life. John on the other hand
came from the desert and was baptizing in river Jordan according to what God had
told him and to the order and law of God, as Luke the evangelist says (Luke
3,2). That is why the Lord wishing to fulfil even this word as divine law, after
he completed thirty years of age, He went to John the Baptist to be baptized as
the rest of men did, although he had no need of baptism being sinless. John
respecting the Lord and thinking of his own worthlessness said: "I have need to
be baptized of thee, and comest thou to me?" But the Lord encourages and moves
John to baptize Him, showing that what he thinks to be improper is most proper,
i.e. the Lord to be baptized by the servant. That is why He told him: "Suffer it
to be so now: for thus it becometh us to fulfil all righteousness". According to
the divine Chrysostomos righteousness is here called by the Lord the perfection
of all the commandments (in his homily on baptism), i.e. it is as if He says:
because I have perfected all the commandments of divine law, this is the only
one that is left, that is why I have to perfect it, too.
This is when John
gave up his objections. So, when the Lord was baptized by him, he immediately
rose from the water and behold! The heavens opened and John saw the Spirit of
God descending like a dove and going to Jesus. But even a voice from heavens
above was heard saying: "This is my beloved Son, in whom I am well pleased".
From this it was made obvious to the Jews that John was not greater than Jesus,
according to the false conviction held by many, but that he was incomparably
lower than Him and that he was His servant. That is why the Spirit descending
addressed the Father's voice to Jesus and obviously showed as if pointing out
with the finger that "This is my beloved Son" was not said about John the
Baptist, although he was glorified and accepted by many, but it was said about
Jesus who was being baptized. When the Lord had completed this legal commandment
of baptism as well, He broke the curse which had been put on Adam because he had
broken the Divine law and, delivering us from condemnation, he brought every
ceremonial law to and end from that time onwards lifting them up to a more
spiritual and perfect level. Following this He discontinued the Jewish baptism
and gave to us, the faithful, the commandment to be baptized with the baptism of
the three immersions and immersions, which has the grace of the Holy Spirit that
was absent from John's baptism. Because, when the Lord had been baptized in that
same river, he completed the shadowy and imperfect baptism and opened the gates
of the spiritual and divine baptism of the Church.