1) The elements of the first line are referred to as the Triple Jewel. The Sangha is the community of migrators (human devotees).
2) The second line places a condition of the first line of the vow, because when we get to heaven, we will change where and to whom we go for refuge since the Sangha (the community of migrators) is earthbound.
3) The third line is the purpose of life.
4) The fourth line is a Wayist ethic, as a lotus plant, we too strive to live a life that benefits others.