Man does not make covenants with God. God offers a covenant and people either accept or reject God’s offer. But until God offers, mankind can do nothing to create a covenant with or for God.
The preface to the Doctrine and Covenants was a revelation intended to introduce an accompanying volume.
the day cometh that they who will not hear the voice of the Lord neither his servants neither give heed to the words of the prophets and apostles shall be cut off from among the people; for they have strayed from mine ordinances and have broken mine everlasting covenant. They seek not the Lord to establish his righteousness but every man walketh in his own way and after the Image of his own God whose Image is in the likeness of the world and whose substance is that of an Idol which waxeth old and shall perish in Babylon even Babylon the great which shall fall. (D&C 1, Emphasis added.)
The Lord cannot fulfill His promises, prophecies and covenants without a covenant people. There are always those who will stray and break His covenant. Among the problems the Lord has to overcome when He makes an effort to gather people together to become His, is the tendency of the proud and defiant to “walk in his own way” and to have an “Image of his own God” as the guide. The path to becoming God’s people does not lie in a solitary walk by those who claim they have their “own way” to follow. It is to be found by living the commandments of Christ among brothers and sisters who grow to have one heart and one mind.
Given the tendency of wicked men to exploit the weak, society has made it impossible to live the Sermon on the Mount or Sermon at Bountiful as a solitary individual. In a godly society where people ‘do unto others other than as they wish to have done to them,’ it is possible to live in peace. Those Sermons by the Lord are meant to change a culture. It is the blueprint for a community that can grow in understanding until they have one heart and one mind. The Lord’s teachings lead inevitably to having “no poor among them” because the society is able to learn to have peace with one another.