Charles Spurgeon Commentary Acts 8:36-37

"And as they went on the way, they came unto a certain water; and the eunuch saith, Behold, [here is] water; what doth hinder me to be baptized? [And Philip said, If thou believest with all thy heart, thou mayest. And he answered and said, I believe that Jesus Christ is the Son of God.]" — Acts 8:36-37 (ASV)

And as they went on their way, they came unto a certain water: and the eunuch said, See, here is water; what doth hinder me to be baptized? And Philip said, If thou believest with all thine heart, thou mayest. And he answered and said, I believe that Jesus Christ is the Son of God.

That is the great confession of faith that is to be made by all who have believed in Jesus.