Whether it was Eve relying on her own strength, or Adam’s suggestion that a boundary be put up that was stricter than God’s Word, what mattered is this. A seed of doubt was planted. The devil took advantage of that, by denying outright what God had said.
The devil has always tried to be like God. When he couldn’t be, he chose to wreck God’s plan. He was successful here. His hatred for God’s perfect love, goodness, and so on knows no bounds. The verses mentioned in Isaiah and Ezekiel show a fallen angel who is very puffed up with pride. Because he was so puffed up, he felt he would try to play on Eve’s pride. It’s just like when he challenged Jesus, in the wilderness, to worship him. Jesus could never fall, because He was God in the flesh as man. The fact the devil even tried that shows how arrogant he is, to think God would worship him.
