Mosiah 2

King Benjamin teaches his people so that they will "learn wisdom". Wisdom being -

"...a wise attitude, belief, or course of action..." In this case, wisdom in serving your fellowman. King Benjamin teaches -

"...that when ye are in the service of your fellow beings ye are only in the service of your God." (Book of Mormon Mosiah 2:17)

Can you really serve God without serving your fellowman? Brigham Young said -

“. . . There is no man who ever made a sacrifice on this earth for the Kingdom of heaven, that I know anything about, except the Savior. He drank the bitter cup to the dregs, and tasted for every man and for every woman, and redeemed the earth and all things upon it. But he was God in the flesh, or he could not have endured it. ‘But we suffer, we sacrifice, we give something, we have preached so long.’ What for? ‘Why, for the Lord.’ I would not give the ashes of a rye straw for the man who feels that he is making sacrifice for God. We are doing this for our own happiness, welfare and exaltation, and for nobody else’s. This is the fact, and what we do, we do for the salvation of the inhabitants of the earth, not for the salvation of the heavens, the angels, or the Gods” (Brigham Young, Discourses of Brigham Young, pp. 176–77).

This is the wisdom King Benjamin taught -

"...if you should render all the thanks and praise which your whole soul has power to possess, to that God who has created you, and has kept and preserved you, and has caused that ye should rejoice, and has granted that ye should live in peace one with another—
21 I say unto you that if ye should serve him who has created you from the beginning, and is preserving you from day to day, by lending you breath, that ye may live and move and do according to your own will, and even supporting you from one moment to another—I say, if ye should serve him with all your whole souls yet ye would be unprofitable servants.
22 And behold, all that he requires of you is to keep his commandments; and he has promised you that if ye would keep his commandments ye should prosper in the land; and he never doth vary from that which he hath said; therefore, if ye do keep his commandments he doth bless you and prosper you.
23 And now, in the first place, he hath created you, and granted unto you your lives, for which ye are indebted unto him.
24 And secondly, he doth require that ye should do as he hath commanded you; for which if ye do, he doth immediately bless you; and therefore he hath paid you. And ye are still indebted unto him, and are, and will be, forever and ever..." (Book of Mormon Mosiah 2:20 - 24)

Finally, I like the quote of Elder Antoine R. Ivins -

“The great value, I believe, that the Church has for us is the opportunity it gives us to serve, for, after all, the great benefits of life come from service. Generous, open-hearted, full service to our fellows, I believe, is the thing which brings us the greatest happiness. We can serve our families and gain happiness by it; we can serve our friends and gain happiness by it; but if we would be happy we must serve and serve generously, and I believe myself that the greatest happiness that comes to me from observing the standards of the Church and meeting my obligations to it is the spiritual values that I get out of that service. I would like to be able to say that I always serve for the sheer love of service. I don’t know whether I can honestly say that or not, but I hope I can. I would like to suggest that all of us who serve, serve for the same motive, out of sheer joy and love of service. I would that every man who accepts a responsibility in a priesthood quorum would accept it because of the opportunity for service which it offers him; not that he be a good deacon so he may be the president of his quorum. Not that he be a good priest that some day he may be made president of the elders’ quorum. Not to be a good bishop, that when the stake is reorganized he may become the president of the stake, because if he serves with that motive, there is very likely to be a day of disappointment for him, but if he serves because he loves to, if he serves because he loves his fellows, then whether the other things come or not, he is never disappointed” (in Conference Report, Oct. 1948, pp. 47–48).