Alma 18:33-35

33 And king Lamoni said: I believe all these things which thou hast spoken. Art thou sent from God?

34 Ammon said unto him: I am a man; and man in the beginning was created after the image of God, and I am called by his Holy Spirit to teach these things unto this people, that they may be brought to a knowledge of that which is just and true;

35 And a portion of that Spirit dwelleth in me, which giveth me knowledge, and also power according to my faith and desires which are in God.

So the king is learning that Ammon's power is God's power.

April, pay special attention to the "according to" -> The spirit of God can dwell in us, which gives knowledge and power, according to our faith and desires which are in God.

I love how desire is also a qualifies. Sometimes I doubt the amount of faith I can muster, but I've got buckets full of desire. Plenty enough to water my faith seeds.