All power belongs to God. The power of God is the sum total of His being which is all He has given to men as gifts. The power of God is also His glory, for this reason, the marks of His presence are His character- love, peace, joy, and all the fruits of His Spirit.
Jesus is a prince, the prince of the principality of peace. This is the character of His power. The gifts of God work through the fruits of the spirit of God. A word of advise, or a word of wisdom from a servant of God, for example, would be laced with love, peace, joy e.t.c, while that coming form an
unGodly spirit, not necessarily person, would be irritating, depressing, angering, basically attacking. These tend to be more prevalent in times of spiritual vulnerability or war.