Not other gods.
“And in all that I have said to you, be circumspect and make no mention of the name of other gods, nor let it be heard from your mouth.” (Exodus 23:13)
Not signs and wonders.
“and after the earthquake a fire, but the Lord was not in the fire; and after the fire a still small voice.” (1 Kings 19:12)
Not a song in heaven — even among the perpetual choir.
“When He opened the seventh seal, there was silence in heaven for about half an hour.” (Revelation 8:1)
Not our words in prayer.
“Likewise the Spirit also helps in our weaknesses. For we do not know what we should pray for as we ought, but the Spirit Himself makes intercession for us with groanings which cannot be uttered.” (Romans 8:26)
“And this is eternal life, that they may know You, the only true God, and Jesus Christ whom You have sent.” (John 17:3)
In the Spirit.
“And my speech and my preaching were not with persuasive words of human wisdom, but in demonstration of the Spirit and of power” (1 Corinthians 2:4)
“speaking to one another in psalms and hymns and spiritual songs, singing and making melody in your heart to the Lord” (Ephesians 5:19)
“Now this is the confidence that we have in Him, that if we ask anything according to His will, He hears us.” (1 John 5:14)