George Leo Haydock, on Gen 2:9

“And the Lord God brought forth of the ground all manner of trees, fair to behold, and pleasant to eat of: the tree of life also in the midst of paradise: and the tree of knowledge of good and evil.”

“The tree of life. So called, because it had that quality, that by eating of the fruit of it, man would have been preserved in a constant state of health, vigour, and strength, and would not have died at all. The tree of knowledge. To which the deceitful serpent falsely attributed the power of imparting a superior kind of knowledge beyond that which God was pleased to give. (Challoner) — Of what species these two wonderful trees were, the learned are not agreed. The tree of knowledge, could not communicate any wisdom to man; but, by eating of its forbidden fruit, Adam dearly purchased the knowledge of evil, to which he was before a stranger. Some say it was the fig-tree, others an apple-tree, Canticle of Canticles viii. 5. But it probably agreed with no species of trees with which we are acquainted, nor was there perhaps any of the same kind in paradise. (Tirinus)”

Imported from an open dataset — not yet checked against the printed edition.