2:9 tree of life. The “tree of life” was an actual tree, with real fruit (note Genesis 3:22; Revelation 22:2) whose properties would have enabled even mortal men to live indefinitely. Though modern scientists may have difficulty in determining the nature of such a remarkable food, they also have been unable so far even to determine the basic physiological cause of aging and death. Thus it is impossible to say scientifically that no chemical substance could exist which might stabilize all metabolic processes and thereby prevent aging.
2:9 tree of knowledge. The same cautions apply to any discussions of the fruit of the tree of knowledge of good and evil, which likewise was genuinely physical. It is conceivable that the fruit contained substances capable of catalyzing physiological decay processes in the body, perhaps affecting even the genetic system. Whether or not this was the case, a “knowledge” of evil would necessarily follow its eating, since evil is fundamentally merely rejection of God’s Word. Man had abundant knowledge of good already, since everything God had made was “very good” (Genesis 1:31), but disobedience would itself constitute an experimental knowledge of evil.