First, let’s consider the kind of response this question might get today. Some preachers would simply say, “There is no point in being baptized.” Others would say, “You don’t want to be baptized in water, but in the Holy Ghost. Still others would say, “You can, but you have to wait for baptizing Sunday.” There might even be some who would say, “If you want to get baptized you need to go to another church, we don’t allow your kind in our church.” Then, there would be some who would say, “We will have to wait for the church to vote on you.” You can probably imagine some other responses this question would get from our mixed up religious world today. None of these answers were the ones Philip gave. We’ll get to it in a minute.
Second, let’s look back to see what caused the eunuch to ask such an interesting question. How did he know what baptism was? How did he know water was necessary? Wasn’t the water bottle he had for drinking on a long journey enough? Why would he make mention of another water source? If we look back a few verses and use some reasoning, we can answer these questions.
In Acts 8:32-35 we read, "The place of the scripture which he read was this, He was led as a sheep to the slaughter; and like a lamb dumb before his shearer, so opened he not his mouth: {33} In his humiliation his judgment was taken away: and who shall declare his generation? for his life is taken from the earth. {34} And the eunuch answered Philip, and said, I pray thee, of whom speaketh the prophet this? of himself, or of some other man? {35} Then Philip opened his mouth, and began at the same scripture, and preached unto him Jesus." Notice that Philip preached ‘Jesus’. We don’t know how long he preached, but it was long enough to tell the eunuch all about who Jesus was, how He had lived, what He had taught, how and why He had died, how He rose again, what instructions He left for His disciples, and how He had returned to Heaven. That could take a good while. But, why did the eunuch respond to all of this teaching about Jesus by asking about being baptized? There is only one logical explanation that fits with the text. Somewhere in Philip’s sermon about Jesus baptism had been taught, and with enough emphasis that the eunuch felt compelled to have this done to him. He also understood that the baptism he needed was not the baptism of the Holy Spirit, but baptism in water. Holy Spirit baptism was special and Philip may well have taught the eunuch about it, certainly he would have taught about the Spirit beginning with the virgin conception and birth; but which one did the eunuch understand was for him? Water baptism.
As for the amount of water and the necessity of water, that also must have been included given the response the eunuch has and the action in verses 37-38. The Greek word for baptize (baptizo) literally means “to make fully wet, to cover in a liquid, or to dip” according to Strong’s Greek Dictionary in the back of the Strong’s Concordance. Given this understanding of the word it no longer seems surprising that the eunuch knew he needed water and a large amount of it. Oh, if only translators had accurately translated how much less confusion there could be today.
Now let’s look at Philip’s answer. The question implies that the eunuch is not sure if he meets all of the qualifications. ‘Hinder’ indicates there may be something holding him back. Is there something else he must do first: some fee to pay, some committee to go before, or some religious experience? No, Philip simply says, “If thou believest with all thine heart, thou mayest" (verse 37). He already knew what he had to believe from the preaching he had just heard. The eunuch did, so, they got out and went down into the water and Philip baptized him (verse 38). They did it right then and there with no delay. The eunuch went home rejoicing (verse 39). And why shouldn’t he? He had found the truth and obeyed what he had been taught: he was saved. Sounds just like what Jesus said in Mark 16:16, "He that believeth and is baptized shall be saved; but he that believeth not shall be damned." The eunuch believed and was baptized, and I hope to meet him in Heaven.