Tonight I'm trying to read a book and I can't pay attention because I'm having a far-out reflection on the inner meaning of Friday.
Friday is, of course, the final day of the Creation, when God makes the land animals and the human beings. In his parting word, God explains to the human beings that they have all the botanical fruits for their food* while the other animals will have the green plants. Friday is the conclusion of the work of Creation.
And so it is with the Lord's Passion on Friday, because the suffering and death of the Lord are the last thing, the end of the story of this world, the end of human history. The Resurrection that inaugurates the New Creation on the First Day--the Deity having rested on the Sabbath according to the very structure of the Creation in which he became incarnate--is properly part of the Last Things and the End Time, Eternity now having invaded history in the Risen Lord.
*I would be very interested to read a theological study of the human diet according to Divine Revelation. On the face of it, it appears that it was only after the covenant with Noah that people started to eat meat (Genesis 9:3), while at the beginning they ate fruit (1:29.) So how was it that Abel offered meat to God, and why did God like it better than the crops offered by Cain?