Then the Spirit said to Philip, "Go near and overtake this chariot." NKJVDid the Spirit speak with a literal voice, or did the Spirit 'speak' by placing the compulsion or thought "Go near and overtake this chariot" on his heart/mind?
Does it make a difference?
In the greater context that is a life in Christ?
All we would know is the specific manner by which the Holy Spirit worked in a specific instance.
What we do know is that Philip was open to the workings of the Holy Spirit; that he knew, however the command came to him, that it was from the Spirit; and from the following verses that he obeys.
I don't want to get caught up in trivialities. Curiosities, which while fine to have interest in, are by-and-large unimportant, not affecting my walk with God or obedience to Him.
Now to Him who is able to keep you from stumbling,
And to present you faultless
Before the presence of His glory with exceeding joy,
To God our Savior,
Who alone is wise,
Be glory and majesty,
Dominion and power,
Both now and forever.