Joseph Smith

You might as well baptize a bag of sand as a man, if not done in view of the remission of sins and getting of the Holy Ghost. Baptism by water is but half a baptism, and is good for nothing without the other half—that is, the baptism of the Holy Ghost. The Savior says, ‘Except a man be born of water and of the Spirit, he cannot enter into the kingdom of God.’ [John 3:5.]”

Joseph Smith, History of the Church, 5:499