38 And he gave orders to stop the chariot. Then both Philip and the eunuch went down into the water and Philip baptized him. 39 When they came up out of the water, the Spirit of the Lord suddenly took Philip away, and the eunuch did not see him again, but went on his way rejoicing. 40 Philip, however, appeared at Azotus and traveled about, preaching the gospel in all the towns until he reached Caesarea.
The symbol of water testifies to our washing as well as to newness of life. It also reflects Christ’s blood, from which we must seek our cleansing; and it teaches that we are remade by God’s Spirit so that, being dead to sin, we may live to righteousness. Thus we have everything that makes for the substance of baptism. That is why the church has always, from the beginning, allowed herself the liberty of varying the rite a little while keeping this substance.