In the Sermon at the Temple, Jesus had told the congregation (as He had in Jerusalem) that they were light to others (Matthew 5:14; 3 Nephi 12:14). Jesus reprises that teaching. They are to hold up their light, and it is Jesus as the Christ who is that light. Even after Christ is no longer in their presence, they are to symbolically invite all to come to Christ, “that [they] might feel and see” as this people had.