Notice that Philip did not ask any questions of the angel of the Lord or the Spirit, but instantly obeyed. How often I have received a prompting from the Spirit and in my mind argued a hundred reasons why it was not the right opportunity. Not Philip! Neither did Philip ask the Ethiopian eunuch why he was reading the prophet Isaiah. The circumstantial facts at that moment were not the issue. The more important question was, “Do you understand what you are reading? God had already directed this man to read Isaiah 53 and the most important thing was connecting this man’s heart and mind with the Word of God. God had a willing servant in Philip who would make that connection.
I will venture to say that the most effective work any believer can do is through close communion with the Holy Spirit and obedience to His direction in our lives. God will always lead us into places and in contact with persons where He is already at work. Joining Him will result in fruitful ministry to God’s glory. Is your obedience leading you to where God is already at work?