Alma 18:21-24

21 And now, if thou wilt tell me concerning these things, whatsoever thou desirest I will give unto thee; and if it were needed, I would guard thee with my armies; but I know that thou art more powerful than all they; nevertheless, whatsoever thou desirest of me I will grant it unto thee.

22 Now Ammon being wise, yet harmless, he said unto Lamoni: Wilt thou hearken unto my words, if I tell thee by what power I do these things? And this is the thing that I desire of thee.

23 And the king answered him, and said: Yea, I will believe all thy words. And thus he was caught with guile.

24 And Ammon began to speak unto him with boldness, and said unto him: Believest thou that there is a God?

Ammon starts with questions, which immediately invites the Spirit to be the master teacher in this conversation - and gives Lamoni the chance to say- "I will believe."

(I've never understood what it meant that he was 'caught with guile'. He seems so sincere. If you know, dear reader, please teach me in the comments.)