Some people refer to this as a "divine appointment". It's an appointment God has written on his calendar, but we don't have written on ours. The way to learn of these appointments or opportunities is to be listening to God on a daily basis. It also takes guts. Philip had to trust that he was hearing God, leave what he was doing, and act on what he heard. If he wasn't hearing God, he might have felt foolish going off somewhere else, waiting by the road and wasting time. But if he hadn't followed the first instruction, he never would have heard the second one, and he would have missed the appointment.
For reflection: Am I listening for possible divine appointments? When I hear an instruction from the Lord, will I follow it?
Let us pray. Holy Spirit, move in me. Move in my spirit. Open me to your voice, your promptings. I want to be accustomed to the sound of your voice guiding me each day.