Genesis 3:1 - "Now the serpent was more subtle and crafty than any living creature of the field which the Lord God had made. And he (Satan) said to the woman, Can it really be that God has said, 'You shall not eat from every tree of the garden'"?
It is my responsibility to see that my thinking, believing and speaking are right. If I don't take that responsibility, the devil is going to think my thoughts for me. He'll actually have me believing what he wants me to believe, and he'll eventually have me confessing what he wants me to confess; framing my world with the wrong words and letting him have dominion over me.
Revelation 12:17 - "So then the dragon was furious (enraged) at the woman, and he went away to wage war on the remainder of her descendants - on those who obey God's commandments and who have the testimony of Jesus Christ."