D&C 42

While in Fayette the Lord said to the saints -

"...that ye might escape the power of the enemy, and be gathered unto me a righteous people, without spot and blameless—
32 Wherefore, for this cause I gave unto you the commandment that ye should go to the Ohio; and there I will give unto you my law..." (Doctrine and Covenants Section 38:31 - 32)

As the saints obeyed His word, the Lord kept His promise. In Kirtland, the Lord revealed to twelve elders of the Church, His law. It think it is important to understand that "His law" is that which we must obey to become like Him. These are laws or requirements that by failure to follow will never allow us to develop the characteristics to live with Him or live His life. Though the Lord delivered multiple laws, my thoughts are to touch on two of them. The First, being related to the family -

"Thou shalt love thy wife with all thy heart, and shalt cleave unto her and none else." (Doctrine and Covenants Section 42:22)

There are only two individuals the Lord has literally commanded to love with all our heart, 1) Him, and 2) our spouse.

Elder Spencer W. Kimball wrote -

“When the Lord says all thy heart, it allows for no sharing nor dividing nor depriving. And, to the woman it is paraphrased: ‘Thou shalt love thy husband with all thy heart and shalt cleave unto him and none else.’

The words none else eliminate everyone and everything. The spouse then becomes preeminent in the life of the husband or wife, and neither social life nor occupational life nor political life nor any other interest nor person nor thing shall ever take precedence over the companion spouse. We sometimes find women who absorb and hover over the children at the expense of the husband, sometimes even estranging them from him.

The Lord says to them: ‘Thou shalt cleave unto him and none else.’

Marriage presupposes total allegiance and total fidelity. Each spouse takes the partner with the understanding that he or she gives totally to the spouse all the heart, strength, loyalty, honor, and affection, with all dignity. Any divergence is sin; any sharing of the heart is transgression. As we should have ‘an eye single to the glory of God,’ so should we have an eye, an ear, a heart single to the marriage and the spouse and family.” (Faith Precedes the Miracle, pp. 142–43.)

The second law that may seem to surprise some is the Lord's instruction -

"...I will consecrate of the riches of those who embrace my gospel among the Gentiles unto the poor of my people who are of the house of Israel.
40 And again, thou shalt not be proud in thy heart; let all thy garments be plain, and their beauty the beauty of the work of thine own hands..." (Doctrine and Covenants Section 42:39 - 40)

Elder George Albert Smith provided some great incite on the meaning of these words. Even though they were delivered almost a century ago, they still seem to apply today -

“This [verse] doesn’t refer to the time of Isaiah nor to the time of Alma, but comes right down to the day in which we live. Through His prophets He admonishes us with reference to our duties, and among the things He says are these: ‘And again, thou shalt not be proud in thy heart; let all thy garments be plain, and their beauty the beauty of the work of thine own hands.’ What a splendid thing to contemplate in our community. . . .

Now, my brethren and sisters, I think that is worthy of our consideration. When discussing the high cost of living, examine your own household, and I am talking to myself while I talk to you. Am I increasing the cost of living by extravagance, or am I teaching my family to make the garments they wear? . . .

Let us set an example; let us live within our means; let us be lenders instead of borrowers; let us not place our homes or the lands that produce our living under mortgages, in order that we may ride in fine conveyances or keep up with the pace set by our neighbors who may be able to afford it. Let us be more concerned about the adornment of our minds that are eternal, rather than adornment of our persons with things that are of no lasting benefit.” (In Conference Report, Apr. 1915, p. 97.)