The roar of [Beorn's] voice was like drums and guns; and he tossed wolves and goblins from his path like straws and feathers. He fell upon their rear, and broke like a clap of thunder through the ring. [...] [H]is wrath was redoubled, so that nothing could withstand him, and no weapon seemed to bite upon him. He scattered the [goblin] bodyguard, and pulled down Bolg himself and crushed him. (18.23-4)

Beorn indeed became a great chief afterwards in those regions and ruled a wide land between the mountains and the wood; and it is said that for many generations the men of his line had the power of taking bear's shape, and some were grim men and bad, but most were in heart like Beorn, if less in size and strength. In their day the last goblins were hunted from the Misty Mountains and a new peace came over the edge of the Wild. (18.51)

Thorin's description of the Arkenstone is like a love poem. Compared to his incredibly stiff, formal style when dealing with important things like hiring Bilbo as the dwarves' official burglar, this passage seems particularly beautiful. Why does Thorin seem to love things so much? Is it simply because he's a dwarf, or is it particular to his character? What sense do we get of how the other dwarves judge Thorin for his love of the Arkenstone?