The window here has 7 rows of 11 panels. That makes a total of 77.
77 reminds me of Jesus teaching about forgiveness.
“ Then came Peter to him, and said, Lord, how oft shall my brother sin against me, and I forgive him? till seven times? Jesus saith unto him, I say not unto thee, Until seven times: but, Until seventy times seven.” Matt 18:21-22 KJV
or "I tell you, not seven times, but seventy-seven times." NIV
(I read this in the original Greek and I think it says seventy-seven times, but apparently the translation works either way.)
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What a great message for the baptistry. Baptism is for the remission of sins. We do baptism after baptism after baptism in that font. Think about how may sins are remitted in this sacred place!
The number 77 is also a reference to the genealogy of Jesus. This time it is the Book of Luke. He lists the generations from Adam to Jesus. And he doesn't spell it out, but maybe you can take my word on this, Jesus is number 77 from Adam.
Genealogy of Christ Book of Kells Picryl
I love temple symbols that connect to Jesus and symbols that connect to family history. This is both.
The connection back to Adam helps reinforce the theme of forgiveness.
Moses 6:53-54
And our father Adam spake unto the Lord, and said: Why is it that men must repent and be baptized in water? And the Lord said unto Adam: Behold I have forgiven thee thy transgression in the Garden of Eden.
Hence came the saying abroad among the people, that the Son of God hath atoned for original guilt, wherein the sins of the parents cannot be answered upon the heads of the children, for they are whole from the foundation of the world.
One more thing:
77 numerically means fullness of fullness or complete completeness.
But alphabetically the letters that make the this number are ayin ע which is 70 and zayin ז which is 7, עז is a word in Hebrew- az. It means goat.
(The root word עָזַז means strong- because the goat was a strong animal.)
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Goats were used for sin offerings, especially on the Day of Atonement.
On the day of Atonement the high priest would take two goats and cast lots. One goat was sacrificed to purify the most holy place, the mercy seat, with its blood. Then the high priest would lay hands on a the other goat and place all the sins upon the animal and send it away into the wilderness.
This is all about forgiveness.