Preach My Gospel, pg. 13; “Surely taking the gospel to every kindred, tongue, and people is the single greatest responsibility we have in mortality…” – Howard W. Hunter
Mark 12:28-30; “And one of the scribes came, and having heard them reasoning together, and perceiving that he had answered them well, asked him, Which is the first commandment of all? 29 And Jesus answered him, The first of all the commandments is, Hear, O Israel; The Lord our God is one Lord: 30 And thou shalt love the Lord thy God with all thy heart, and with all thy soul, and with all thy mind, and with all thy strength: this is the first commandment.”
No, your greatest responsibility is to worship God. And didn’t Smith say the greatest responsibility was to seek after your dead?