This was a baptism of water, exactly the same as the baptism of Cornelius and his followers; baptism of actual water was necessary immediately after the preaching of the Word. In this case the water was not the word. If the eunuch were born of the word and washed by the word what then was the need for water?
Concerning this, I would like to speak about an important subject: The importance of water and its symbols in the Holy Bible.