The rich symbolism in the painting is explained via an informative interactive page on the McNaughton Art website:
From the Doctrine and Covenants of the Church of Jesus Christ of Latter-day Saints, I quote the words of the Savior:
77 According to the laws and aconstitution of the people, which I have suffered to be established, and should be maintained for the brights and protection of all flesh, according to just and holy principles;
78 That every man may act in doctrine and principle pertaining to futurity, according to the moral aagency which I have given unto him, that every man may be baccountable for his own sins in the day of cjudgment.
79 Therefore, it is not right that any man should be in abondage one to another.