Cheryl Schatz

Another good note is that when God says that “but now lest he reach out his hand…” the term “lest” is God’s way to prevent a predictable event.

conj.: — 1. w. impf. (106 ×), prevention of a theoretically possible event: lest, so that … not; so that he does not stretch out Gn 3:22; — 2. w. impf., prevention of an otherwise predictable event:
A concise Hebrew and Aramaic lexicon of the Old Testament. (293).

This is the whole issue of the sin nature. It is predictable because of the new nature that lies within Adam.