Alma 17:5-9

5 Now these are the circumstances which attended them in their journeyings, for they had many afflictions; they did suffer much, both in body and in mind, such as hunger, thirst and fatigue, and also much labor in the spirit.

6 Now these were their journeyings: Having taken leave of their father, Mosiah, in the first year of the judges; having refused the kingdom which their father was desirous to confer upon them, and also this was the minds of the people;

7 Nevertheless they departed out of the land of Zarahemla, and took their swords, and their spears, and their bows, and their arrows, and their slings; and this they did that they might provide food for themselves while in the wilderness.

8 And thus they departed into the wilderness with their numbers which they had selected, to go up to the land of Nephi, to preach the word of God unto the Lamanites.

9 And it came to pass that they journeyed many days in the wilderness, and they fasted much and prayed much that the Lord would grant unto them a portion of his Spirit to go with them, and abide with them, that they might be an instrument in the hands of God to bring, if it were possible, their brethren, the Lamanites, to the knowledge of the truth, to the knowledge of the baseness of the traditions of their fathers, which were not correct.

This is the second time I've read that they fasted and prayed much, for the Lamanites.

I'm not sure if that is more faith, or more love? Or a perfect fulness of the pair?

No wonder such miracles happened.