Every trial and experience you have passed through is necessary for your salvation (Brigham Young)

Can you discern and understand the dealings of the Lord with this people from the beginning? If we can understand this, it is indeed a matter of great rejoicing to us. All intelligent beings who are crowned with crowns of glory, immortality, and eternal lives must pass through every ordeal appointed for intelligent beings to pass through, to gain their glory and exaltation. Every calamity that can come upon mortal beings will be suffered to come upon the few, to prepare them to enjoy the presence of the Lord. If we obtain the glory that Abraham obtained, we must do so by the same means that he did. If we are ever prepared to enjoy the society of Enoch, Noah, Melchizedek, Abraham, Isaac, and Jacob, or of their faithful children, and of the faithful Prophets and Apostles, we must pass through the same experience, and gain the knowledge, intelligence, and endowments that will prepare us to enter into the celestial kingdom of our Father and God. How many of the Latter-day Saints will endure all these things, and be prepared to enjoy the presence of the Father and the Son? You can answer that question at your leisure. Every trial and experience you have passed through is necessary for your salvation.

Brigham Young, Journal of Discourses 8:150 (emphasis added)

the Word of God produces joy, light and happiness (Orson Pratt)

The word of God which is planted in your hearts begins to grow, to produce joy, light, and happiness; your mind begins to understand; you begin to receive revelation, and to receive those communications from the heavens that cause you to enjoy those blessings that you have heard spoken of by the servants of God. This makes all the Latter-day Saints witnesses; and thus we have a cloud of witnesses—a great army that can witness the truths of heaven as they have been revealed in these last days. This Spirit of revelation gives the Latter-day Saints boldness in their testimony.

Orson Pratt

8:46

real peace and happiness come from serving the Lord

It is a mistaken idea in the inhabitants of the earth to conclude that it will not do for them to yield obedience to the commandments of heaven, lest it should abridge them in their comforts and in their enjoyments; for there is no real peace, there is no real happiness in anything in heaven or on the earth, except to those who serve the Lord. In His service there is joy, there is happiness; but they are not to be found anywhere else. In it there are peace and comfort; but when the soul is filled with joy, with peace, and with glory, and is perfectly satisfied therewith a person even then has but little idea of that which is in store for all the faithful.

Thrust a man into prison and bind him with chains, and then let him be filled with the comfort and with the glory of eternity, and that prison is a palace to him. Again, let a man be seated upon a throne with power and dominion in this world, ruling his millions and millions, and without that peace which flows from the Lord of Hosts—without that contentment and joy that comes from heaven, his palace is a prison; his life is a burden to him; he lives in fear, in dread, and in sorrow. But when a person is filled with the peace and power of God, all is right with him.

Brigham Young

Journal of Discourses

5:1-2

happiness not found in gold

The whole world is after happiness. It is not found in gold and silver, but it is in peace and love.

Brigham Young

12:314