What Does Baptism Mean?
Baptism portrays what happened to us when we became Christians. This is what happened to us: we were united to Christ. His death became our death. We died with him. And in the same instant, his life became our life. We are now living out the life of Christ in us. And all this is experienced through faith.
This is what it means to be a Christian - to live in the reality of what our baptism portrays: day by day we look away from ourselves to God and say, "Because of Christ, your Son, I come to you. In him I belong to you. I am at home with you. He is my only hope of acceptance with you. I receive that acceptance anew every day. My hope is based on his death for me and my death in him. My life in him is a life of faith in you, Father. Because of him I trust your working in me and for me. The same power and glory that you used to raise him from the dead you will use to help me. In that promise of future grace I believe, and in that I hope. That is what makes my life new. O Christ, how I glory in what my baptism portrays! Thank you for dying my death for me and giving new life to me. Amen." John Piper, DesiringGod.org