Jerome : (Verse 12) And over the torrent (or river) there shall spring up on its banks on both sides every fruit-bearing tree, its leaf shall not wither (or it shall not grow old): and its fruit shall not fail. Every month they shall bring forth first fruits (or all things shall be renewed); because its waters shall go forth from the sanctuary, and its fruit shall be for food, and its leaves for medicine (or its ascent for health). But above the torrent or river, on its banks, every fruitful tree, or as they all agree, βρῶσιμον (Al. βρῶμα) which gives food and nourishment and can be eaten, is called in the Hebrew language, Machal, and nothing will decay in it according to the Septuagint, but its fruits will be renewed daily, and its leaves will not wither, and its fruit will not fail; according to what is written in the first psalm. And he shall be like a tree, which is planted near the running waters, that shall bring forth its fruit in due season. And his leaf shall not fall off (Psalms 1:3). Each month, he says, it shall bring forth its firstfruits, or as it is written in the Septuagint: Its fruit shall be its firstfruits in its renewal; so that all the fruits of the believers may be firstfruits, and each month may be assigned to each apostle. And this shall happen, because its waters shall come forth from the sanctuary: Let us not think that the abundance of banks, trees, or months, is the cause and source of such great fruitfulness: because its waters shall come forth from the sanctuary. Therefore it is not of the one who wants or of the one who runs, but of God who shows mercy (Rom. 9:16). The principle of all these trees is the tree of life, which is understood as wisdom, of which it is written: The tree of life is to all who believe in it (Prov. 3). And that which is said: And its fruits shall be for food, and its leaves for medicine, demonstrates the sacraments of the divine books: of which one pertains to the letter, the other to the spirit: so that we may understand simple words in the leaves, and the hidden meaning in the fruits. For just as the knowledge of the Scriptures leads to the kingdom of heaven and provides us with the bread that says, 'I am the bread that came down from heaven' (John 6:41), so do its leaves contain moral doctrine and offer healing, so that they may heal the wounds of sinners. Concerning the leaves, which are called 'Ale' in Hebrew, they were translated by the Septuagint as 'ascension,' because it can also be understood in such a way that after partaking of the nourishment of the fruits, we ascend to heavenly things by the admonitions of the words. — Commentary on Ezekiel