Tell me, with whom does God speak and deal when you are baptised? Is it not true that this Baptism is intended for you alone and for no other person? You derive the benefit of your baptism, not others. If they want to be benefited by Baptism, they must also be baptised personally.
But what does God tell you and each person who permits himself to be baptised? This is the promise God gives in Baptism: "Whoever believes and is baptised will be saved," (Mark 16:16). Again, you are baptised into the death of Christ (Romans 6:3), into the truth that he died for you and by his death freed you from your sins and death. How then, could God speak in a friendlier way with you and more surely and specifically include your person in the Word than he does in Baptism?
There is on earth no greater comfort than Baptism.
Dr. Martin Luther