These verses declare the depth of the change that the sons of Mosiah underwent. They were “the vilest of sinners” (verse 4). The change from vile to redeemed was so great and soul transforming that it altered their entire outlook on life.
This type of dramatic change is almost the exclusive province of those who have come so far so fast. While all may feel the transforming power of the spirit, those who have made such a dramatic and drastic change can taste that change more deeply that those for whom their transformation has been more incremental. It is these who can remember the “taste” of both sides of the judgment who are most sensitive to others who are in the state they have most recently left.
After their redemption, they felt so powerfully the joy of God that they desired to share it with the Lamanites. They could see how this new perspective might completely alter the ages-old conflicts between Lamanite and Nephite (verse 2). This was not a change completely founded in a concern for those who might have been sympathetic to their former life, but a desire for any and all to feel the tremendous joy they had felt.
In the modern world, new converts are very likely to feel this exact feeling. The newness and excitement of the gospel makes them desirous to share with all. Unfortunately, this is a feeling that appears to wane, and the longer we live with the benefits of the gospel, the less we understand how precious and exciting it is. The feeling can be recaptured, but not without conscious effort on our parts.