Charles Spurgeon Commentary Luke 4:41

"And demons also came out from many, crying out, and saying, Thou art the Son of God. And rebuking them, he suffered them not to speak, because they knew that he was the Christ." — Luke 4:41 (ASV)

Perhaps they thought that their testimony would tend to blacken his character. We are, in a sense, pleased when bad men find fault with us, for that is really the best commendation that they can give us; but when they begin to praise us, we feel suspicious that there is something wrong. We think of how Christ acted when the devils said to him, Thou art Christ, the Son of God, and we would rather they held their tongues. What a vile thing sin is, for it makes even good words to be evil when they come out of sinful lips!