Twice in this passage, Philip responds to the prompting of the Spirit.
In verse 26 the Spirit tells Philip to
“Get up and go towards the south to the road that goes down from Jerusalem to Gaza.”
“... he got up and went” (verse 27).
Philip has learned to discern and respond to the leading of the Spirit and, as a result, he is in the right place at the right time and ready for a divine appointment.
A divine appointment is when God leads us to be in the right place at the right time to be a witness for Christ.
Because Philip was in the right place at the right time, he is able to introduce the Ethiopian eunuch to Christ.
Philip's willingness to follow the leading of the Holy Spirit results not only in this one man coming to know the salvation of Christ, but tradition holds that the eunuch, in turn, founded the church in Ethiopia.
One act of faithfulness was multiplied in such a way that an entire nation came to know the good news of Christ.