Ensign, November 2009, pg. 28; “The effect of God’s commandments and laws is not changed to accommodate popular behavior or desires. If anyone thinks that godly or parental love for an individual grants the loved one license to disobey the law, he or she does not understand either love or law. The Lord declared: ‘That which breaketh a law, and abideth not by law, but seeketh to become a law unto itself, and willeth to abide in sin, and altogether abideth in sin, cannot be sanctified by law, neither by mercy, justice, nor judgment. Therefore, they must remain filthy still’ (D&C 88:35).” – Dallin H. Oaks
Galatians 5:16-17; “And so it is written, The first man Adam was made a living soul; the last Adam was made a quickening spirit. 46 Howbeit that was not first which is spiritual, but that which is natural; and afterward that which is spiritual. 47 The first man is of the earth, earthy: the second man is the Lord from heaven.”
If the Mormon teaching above is true then why did they stop practicing polygamy in 1890 or why did they suddenly admit black people into the Church in June 1978?