Why do you suppose Bilbo hides the Arkenstone in his pocket before the Dwarves can see it?

Bilbo felt that stealing the Arkenstone made him a true burglar...... he felt that keeping it was justified as it was promised that he could pick and choose his own share of the treasure. He hid the stone because he knew he was doung wrong.

"It was the Arkenstone, the Heart of the Mountain. So Bilbo guessed from Thorin's description; but indeed there could not be two such gems, even in so marvellous a hoard, even in all the world. Ever as he climbed, the same white gleam had shone before him and drawn his feet towards Slowly it grew to a little globe of pallid light. Now as came near, it was tinged with a flickering sparkle of man colours at the surface, reflected and splintered from the wavering light of his torch. At last he looked down upon it and he caught his breath. The great jewel shone before he feet of its own inner light, and yet, cut and fashioned by the dwarves, who had dug it from the heart of the mountain long ago, it took all light that fell upon it and-changes it into ten thousand sparks of white radiance shot with glints of the rainbow.

Suddenly Bilbo's arm went towards it drawn by it enchantment. His small hand would not close about it for it was a large and heavy gem; but he lifted it, shut his eyes, and put it in his deepest pocket.

"Now I am a burglar indeed!" thought he. "But I suppose I must tell the dwarves about it-some time. The did say I could pick and choose my own share; and I think I would choose this, if they took all the rest!" All the same he had an uncomfortable feeling that the picking and choosing had not really been meant to include this marvellous gem, and that trouble would yet come of it. Now he went on again. Down the other side of the great mound he climbed, and the spark of his torch vanished from the sight of the watching dwarves. But soon they saw it far away in the distance again. Bilbo was crossing the floor of the hall."

Why did Bilbo take the Arkenstone? What were his feelings when he took it?

Bilbo felt that stealing the Arkenstone made him a true burglar. He felt that keeping it was justified as it was promised that he could pick and choose his own share of the treasure. He hid the stone because he knew he was doing something wrong and Thorin also wanted the stone.

"It was the Arkenstone, the Heart of the Mountain. So Bilbo guessed from Thorin's description; but indeed there could not be two such gems, even in so marvellous a hoard, even in all the world. Ever as he climbed, the same white gleam had shone before him and drawn his feet towards Slowly it grew to a little globe of pallid light. Now as came near, it was tinged with a flickering sparkle of man colours at the surface, reflected and splintered from the wavering light of his torch. At last he looked down upon it and he caught his breath. The great jewel shone before he feet of its own inner light, and yet, cut and fashioned by the dwarves, who had dug it from the heart of the mountain long ago, it took all light that fell upon it and-changes it into ten thousand sparks of white radiance shot with glints of the rainbow.

Suddenly Bilbo's arm went towards it drawn by it enchantment. His small hand would not close about it for it was a large and heavy gem; but he lifted it, shut his eyes, and put it in his deepest pocket.

"Now I am a burglar indeed!" thought he. "But I suppose I must tell the dwarves about it-some time. The did say I could pick and choose my own share; and I think I would choose this, if they took all the rest!" All the same he had an uncomfortable feeling that the picking and choosing had not really been meant to include this marvellous gem, and that trouble would yet come of it. Now he went on again. Down the other side of the great mound he climbed, and the spark of his torch vanished from the sight of the watching dwarves. But soon they saw it far away in the distance again. Bilbo was crossing the floor of the hall."