'Deludes' in the Bible

For if anyone thinks he is something [special] when [in fact] he is nothing [special except in his own eyes], he deceives himself.

Do not be deceived, God is not mocked [He will not allow Himself to be ridiculed, nor treated with contempt nor allow His precepts to be scornfully set aside]; for whatever a man sows, this and this only is what he will reap.