Jerome of Stridon
“And a tall tree,” he continues, “grew there.” John did not speak of trees, but of one tree. But if the tree is one, how could it grow on both sides of the river? If he had said, “I saw trees,” one could imagine that some grew on one side of the river and others on the other. Yet it is said that one tree grew on both sides of the river. One spring flows from the throne of God, and this is the grace of the Holy Spirit. The grace of the Holy Spirit is contained in Holy Scripture, in this river of Scripture. This river has two banks, the Old and New Testaments, and on both sides of it the tree grows, which is Christ. This tree bore twelve fruits in a year, that is, in every month. We can receive the fruits of this tree only through the apostles.
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If someone comes to the tree through the apostles, he necessarily receives fruit. He gathers the fruits of Holy Scripture and tastes the divine meaning hidden in its words. If someone cannot gather the fruits, it is because he is still weak. He is not yet a disciple, but still belongs to the crowd, to those outside, to the Gentiles. Unable to pluck the fruit, he receives the words, that is, the leaves, for the healing of the nations. If someone is still among the Gentiles, among the crowd, and is not yet a disciple, he gathers the leaves themselves and receives the literal meaning as medicine. Therefore Scripture is medicine.