The Cedar's Tender Twig and the Mustard Seed
Old Testament: Ezechiel 17:22-23
... I myself will take of the marrow of the high cedar, and will set it: I will crop off a tender twig from the top of the branches thereof, and I will plant it on a mountain high and eminent. On the high mountains of Israel will I plant it, and it shall shoot forth into branches, and shall bear fruit, and it shall become a great cedar: and all birds shall dwell under it, and every fowl shall make its nest under the shadow of the branches thereof.
New Testament: Matthew 13:31-32
... The kingdom of heaven is like to a grain of mustard seed, which a man took and sowed in his field. Which is the least indeed of all seeds; but when it is grown up, it is greater than all herbs, and becometh a tree, so that the birds of the air come, and dwell in the branches thereof.
The connection
Ezechiel's oracle takes the smallest possible piece of a great tree, a single tender twig cropped from its top, and promises that God Himself will plant it and make it a great cedar sheltering every bird. Christ's parable takes the smallest possible seed and promises the same growth and the same shelter, birds dwelling in its branches. Both texts insist the greatness is not in the beginning but in what God does with a beginning He chooses to be small. Even the Douay-Rheims' own marginal note glosses the tender twig as Christ, planted on "the high mountain of his church, to which all nations flow.".
Moral sense
The smallness a soul is tempted to despise in its own beginnings, in faith, in charity, in any grace just started, is exactly the size God has always preferred to work with.
Anagogical sense
The great cedar and the grown mustard tree both picture the Church at the end of her growth, every nation as a bird finding shelter in branches that began as something a man could crop off with his hand.
Warrant
The Douay-Rheims marginal note on Ezechiel 17:22 glosses "a tender twig" as Christ, reflecting the received Catholic reading. I could not locate a specific patristic citation making this exact Ezechiel-to-mustard-seed pairing explicit.
Catechism of the Catholic Church, paragraph 764.
The verses
Ezechiel 17:22 · Ezechiel 17:23 · Matthew 13:31 · Matthew 13:32
