From the Baha'i scriptures:
"Chapter 19. THE BAPTISM OF CHRIST
"Question.--It is said in the Gospel of St. Matthew, chapter 3, verses 13, 14, 15: 'Then cometh Jesus from Galilee to Jordan unto John, to be baptized of him. But John forbade Him, saying, I have need to be baptized of Thee, and comest Thou to me? And Jesus answering said unto him, Suffer it to be so now: for thus it becometh us to fulfil all righteousness. Then he suffered Him.'
"What is the wisdom of this: since Christ possessed all essential perfection, why did He need baptism?
"Answer.--The principle of baptism is purification by repentance. John admonished and exhorted the people, and caused them to repent; then he baptized them. Therefore, it is apparent that this baptism is a symbol of repentance from all sin: its meaning is expressed in these words: "O God! as my body has become purified and cleansed from physical impurities, in the same way purify and sanctify my spirit from the impurities of the world of nature, which are not worthy of the Threshold of Thy Unity!" Repentance is the return from disobedience to obedience. Man, after remoteness and deprivation from God, repents and undergoes purification: and this is a symbol signifying "O God! make my heart good and pure, freed and sanctified from all save Thy love."
"As Christ desired that this institution of John should be used at that time by all, He Himself conformed to it in order to awaken the people and to complete the law of the former religion. Although the ablution of repentance was the institution of John, it was in reality formerly practiced in the religion of God.
"Christ was not in need of baptism; but as at that time it was an acceptable and praiseworthy action, and a sign of the glad tidings of the Kingdom, therefore, He confirmed it. However, afterward He said the true baptism is not with material water, but it must be with spirit and with water. In this case water does not signify material water, for elsewhere it is explicitly said baptism is with spirit and with fire, from which it is clear that the reference is not to material fire and material water, for baptism with fire is impossible.
"Therefore, the spirit is the bounty of God, the water is knowledge and life, and the fire is the love of God. For material water does not purify the heart of man; no, it cleanses his body. But the heavenly water and spirit, which are knowledge and life, make the human heart good and pure; the heart which receives a portion of the bounty of the Spirit becomes sanctified, good and pure--that is to say, the reality of man becomes purified and sanctified from the impurities of the world of nature. These natural impurities are evil qualities: anger, lust, worldliness, pride, lying, hypocrisy, fraud, self-love, etc.
"Man cannot free himself from the rage of the carnal passions except by the help of the Holy Spirit. That is why He says baptism with the spirit, with water and with fire is necessary, and that it is essential--that is to say, the spirit of divine bounty, the water of knowledge and life, and the fire of the love of God. Man must be baptized with this spirit, this water and this fire so as to become filled with the eternal bounty. Otherwise, what is the use of baptizing with material water? No, this baptism with water was a symbol of repentance, and of seeking forgiveness of sins.
But in the cycle of Bahá'u'lláh there is no longer need of this symbol; for its reality, which is to be baptized with the spirit and love of God, is understood and established. "
--Some Answered Questions
