Acts 8:29-30 (KJV) Then the Spirit said unto Philip, Go near, and join thyself to this chariot. 30 And Philip ran thither to him, and heard him read the prophet Esaias, and said, Understandest thou what thou readest?
When God commanded Philip to witness to the eunuch, Philip ran to him. How fast do you respond? Do you put up excuses? Do you ask God for more confirmation that he really wants you to do what he commanded? When God commands, just do it.