Matthew 3:11 (AMP) 

"As for me, I baptize you with water because of [your] repentance [that is, because you are willing to change your inner self-your old way of thinking, regret your sin and live a changed life], but He (the Messiah) who is coming after me is mightier [more powerful, more noble] than I, whose sandals I am not worthy to remove [even as His slave]; He will baptize you [who truly repent] with the Holy Spirit and [you who remain unrepentant] with fire (judgment)."