Here are some gems from this year’s Priesthood and Relief Society Manual. The more I read of Joseph Smith, the more dense and insightful his thinking seems. The list, of course, is mine. Feel free to add your own!
From page 520:

There has been a great difficulty in getting anything into the heads of this generation. It has been like splitting hemlock knots with a corn-dodger [a piece of corn bread] for a wedge, and a pumpkin for a beetle [a wooden mallet]. Even the Saints are slow to understand.
I have tried for a number of years to get the minds of the Saints prepared to receive the things of God; but we frequently see some of them, after suffering all they have for the work of God, will fly to pieces like glass as soon as anything comes that is contrary to their traditions: they cannot stand the fire at all. How many will be able to abide a celestial law, and go through and receive their exaltation, I am unable to say, as many are called, but few are chosen [see D&C 121:40].

From page 404:

While one portion of the human race is judging and condemning the other without mercy, the Great Parent of the universe looks upon the whole of the human family with a fatherly care and paternal regard; He views them as His offspring, and without any of those contracted feelings that influence the children of men, causes ‘His sun to rise on the evil and on the good, and sendeth rain on the just and on the unjust.’ [Matthew 5:45.]
He holds the reins of judgment in His hands; He is a wise Lawgiver, and will judge all men, not according to the narrow, contracted notions of men, but, ‘according to the deeds done in the body whether they be good or evil,’ or whether these deeds were done in England, America, Spain, Turkey, or India. He will judge them, ‘not according to what they have not, but according to what they have’; those who have lived without law, will be judged without law, and those who have a law, will be judged by that law. We need not doubt the wisdom and intelligence of the Great Jehovah; He will award judgment or mercy to all nations according to their several deserts, their means of obtaining intelligence, the laws by which they are governed, the facilities afforded them of obtaining correct information, and His inscrutable designs in relation to the human family; and when the designs of God shall be made manifest, and the curtain of futurity be withdrawn, we shall all of us eventually have to confess that the Judge of all the earth has done right [see Genesis 18:25].

From page 466:

I would esteem it one of the greatest blessings, if I am to be afflicted in this world, to have my lot cast where I can find brothers and friends all around me.

From page 40:

If a man learns nothing more than to eat, drink and sleep, and does not comprehend any of the designs of God, the beast comprehends the same things. It eats, drinks, sleeps, and knows nothing more about God; yet it knows as much as we, unless we are able to comprehend by the inspiration of Almighty God. If men do not comprehend the character of God, they do not comprehend themselves. I want to go back to the beginning, and so lift your minds into more lofty spheres and a more exalted understanding than what the human mind generally aspires to.

From page 267:

The things of God are of deep import; and time, and experience, and careful and ponderous and solemn thoughts can only find them out. Thy mind, O man! if thou wilt lead a soul unto salvation, must stretch as high as the utmost heavens, and search into and contemplate the darkest abyss, and the broad expanse of eternity—thou must commune with God. How much more dignified and noble are the thoughts of God, than the vain imaginations of the human heart! . . .

From page 346:

All persons are entitled to their agency, for God has so ordained it. He has constituted mankind moral agents, and given them power to choose good or evil… Since the God of heaven has left these things optional with every individual, we do not wish to deprive them of it…
It is one of the first principles of my life, and one that I have cultivated from my childhood, having been taught it by my father, to allow every one the liberty of conscience. . . . In my feelings I am always ready to die for the protection of the weak and oppressed in their just rights.
Meddle not with any man for his religion: all governments ought to permit every man to enjoy his religion unmolested. No man is authorized to take away life in consequence of difference of religion, which all laws and governments ought to tolerate and protect, right or wrong… Although I never feel to force my doctrine upon any person, I rejoice to see prejudice give way to truth, and the traditions of men dispersed by the pure principles of the Gospel of Jesus Christ.

From page 523:

If I had not actually got into this work and been called of God, I would back out. But I cannot back out: I have no doubt of the truth.
I am a rough stone. The sound of the hammer and chisel was never heard on me until the Lord took me in hand. I desire the learning and wisdom of heaven alone.

Page 525, though the first two sentences I include below were not quoted:

This is good doctrine. It tastes good. I can taste the principles of eternal life, and so can you. They are given to me by the revelations of Jesus Christ; and I know that when I tell you these words of eternal life as they are
given to me, you taste them, and I know that you believe them. You say honey is sweet, and so do I. I can also taste the spirit of eternal life. I know that it is good; and when I tell you of these things which were given me by inspiration of the Holy Spirit, you are bound to receive them as sweet, and rejoice more and more. . . .

From page 132:

A person may profit by noticing the first intimation of the spirit of revelation; for instance, when you feel pure intelligence flowing into you, it may give you sudden strokes of ideas, so that by noticing it, you may find it fulfilled the same day or soon; (i.e.) those things that were presented unto your minds by the Spirit of God, will come to pass; and thus by learning the Spirit of God and understanding it, you may grow into the principle of revelation, until you become perfect in Christ Jesus.

From page 175-176:

I will tell you what I want. If tomorrow I shall be called to lie in yonder tomb, in the morning of the resurrection let me strike hands with my father, and cry, ‘My father,’ and he will say, ‘My son, my son,’ as soon as the rock rends and before we come out of our graves. “And may we contemplate these things so? Yes, if we learn how to live and how to die. When we lie down we contemplate how we may rise in the morning; and it is pleasing for friends to lie down together, locked in the arms of love, to sleep and wake in each other’s embrace and renew their conversation.
Would you think it strange if I relate what I have seen in vision in relation to this interesting theme? Those who have died in Jesus Christ may expect to enter into all that fruition of joy when they come forth, which they possessed or anticipated here.
So plain was the vision, that I actually saw men, before they had ascended from the tomb, as though they were getting up slowly. They took each other by the hand and said to each other, ‘My father, my son, my mother, my daughter, my brother, my sister.’ And when the voice calls for the dead to arise, suppose I am laid by the side of my father, what would be the first joy of my heart? To meet my father, my mother, my brother, my sister; and when they are by my side, I embrace them and they me. . .