Charles Spurgeon Commentary Acts 8:29-30

"And the Spirit said unto Philip, Go near, and join thyself to this chariot. And Philip ran to him, and heard him reading Isaiah the prophet, and said, Understandest thou what thou readest?" — Acts 8:29-30 (ASV)

Then the Spirit said to Philip, Go near, and join yourself to this chariot. And Philip ran there to him, and heard him read the prophet Esaias, and said, Do you understand what you are reading?

That is the main thing; a religion that is not based upon understanding will soon come to an end. An emotional religion—one that is nothing but emotion—will be temporary and transient religion; so Philip inquired of the eunuch, Do you understand what you are reading?