This earth abides by a Celestial Law. (D&C 88: 25.) Therefore, it is destined to become a Celestial Kingdom because it will be sanctified by a Celestial Law. (D&C 88: 25-29.) The destiny of the earth is glory. (D&C 84: 101.) Therefore, to “inherit the earth” is to inherit a Celestial Glory.
Since this is so, you need to understand the definition of “meekness.” Elder Hales made these remarks about “meekness” in General Conference: “
I’ve given another explanation in Beloved Enos. There I explained it is necessary to be meek first before being trusted with great power. The power to seal on earth and in heaven is something which cannot be handled apart from meekness. Without meekness a man cannot be trusted with such a power. When Enos used the power, he did so meekly. He asked rather than pronounced. He petitioned rather than decreed. Though the Lord would hearken to his words, he refrained from acting.
This is because the proper way to use such authority is only and strictly in conformity with the Lord’s will. The reason Nephi received the authority was because he was meek. The account of the conferral is also the account of his qualification:
Therefore, when the Lord had tried him and determined he was willing to serve Him at all costs, he qualifies to receive trust from God. That trust allows the Lord to confer upon the man great power. (See also TPJS p. 150: “After a person has faith in Christ, repents of his sins, is baptized for the remission of his sins, and receives the Holy Ghost (by the laying on of hands), which is the first Comforter, then let him continue to humble himself before God, hungering and thirsting after righteousness and living by every word of God. The Lord will soon say unto him, ‘Son, thou shalt be exalted.’ When the Lord has thoroughly proved him and finds that the man is determined to serve him at all hazards, then the man will find his calling and election made sure.”)
Meekness is required to qualify for great power. And you know a man is meek when, having great power, he uses it strictly in conformity with the Lord’s will; never varying from the Lord’s command, and never pursuing his own agenda. This kind of meekness is men is a rare thing. Nephi, after receiving that power, was instructed that he was to deliver the Lord’s message: “thus saith the Lord God, who is Almighty: Except ye repent ye shall be smitten, even unto destruction.” It is the Lord’s judgment. It is a meek man who delivers it. But such judgments only come after the Lord has a meek soul upon whom He can place this trust. For He has covenanted to always first employ such a servant before imposing judgments upon mankind. (Amos 3: 7.)
Therefore, when the Lord teaches the “meek shall inherit the earth” it is a statement which includes exaltation for the meek. It is one of the Lord’s deepest teachings, and most profound descriptions of those who will be exalted and why.