What does Genesis 3:8 mean?
Adam and Eve have sinned against God. In direct disobedience to His command, they have eaten from the Tree of the Knowledge of Good and Evil. The previous verse revealed the first consequence of their sin. They moved from being innocently naked and unashamed to being self-conscious over their nakedness and desperate to cover themselves. Now we see their shame and guilt also drives them to hide from God. Their sin has broken their intimate relationship with Him.The implication of this verse is that God would regularly come to the garden to spend time with Adam and Eve. It's impossible to know exactly what that would have been like. The passage raises many interpretations. How does God, who is a spirit, "walk?" What form did He take to be with them? Some see this as a purely metaphorical expression. Others imagine this to be a pre-incarnate Jesus Christ.
What we will see, though, is that one of the greatest consequences of sin was the loss of those face-to-face moments with the Creator. Instead of enjoying His presence, Adam's and Eve's first instinct was to hide from Him. Sin always separates us from God.