In The Hobbit, what is a quote where Bilbo said that he wants to go on the adventure?

Bilbo rejects the adventure at first, but changes his mind when the dwarves leave without him. 

We are told that the Baggins family is well-respected because they are responsible and never go on adventures.  Going on adventures is frowned upon in the Shire.  Hobbits don’t like adventures.  They like things to be dependable and quiet.  However, Bilbo’s story is a little bit different. 

This is a story of how a Baggins had an adventure,...

Bilbo rejects the adventure at first, but changes his mind when the dwarves leave without him. 

We are told that the Baggins family is well-respected because they are responsible and never go on adventures.  Going on adventures is frowned upon in the Shire.  Hobbits don’t like adventures.  They like things to be dependable and quiet.  However, Bilbo’s story is a little bit different. 

This is a story of how a Baggins had an adventure, found himself doing and saying things altogether unexpected. He may have lost the neighbors’ respect, but he gained—well you will see whether he gained anything in the end. (Ch. 1) 

The reason Bilbo went on an adventure is that he is part Took.  Apparently the Tooks are a less respectable family, since they are open to adventuring.  The Took side of Bilbo took him on an adventure.  It helps to have wizards for friends.  They always get you into trouble. 

When Gandalf the wizard first told Bilbo that he was looking for someone to go on an adventure with him, Bilbo refused.  Then thirteen dwarves showed up at Bilbo’s door, had a great party, and talked a lot about a dragon and the treasure he was guarding.  They also commented that Bilbo looked “more like a grocer than a burglar,” and that upset Bilbo’s pride.  

So after that the party went along very merrily, and they told stories or sang songs as they rode forward all day, except of course when they stopped for meals. These didn't come quite as often as Bilbo would have liked them, but still he began to feel that adventures were not so bad after all. (Ch. 2) 

The dwarves actually turned out to be pretty considerate guests.  They cleaned up after themselves, and left in the morning.  Unfortunately, they left on the adventure without Bilbo. Bilbo had decided he wanted to go, without even realizing it. 

"Don't be a fool, Bilbo Baggins!" he said to himself, "thinking of dragons and all that outlandish nonsense at your age!" (Ch. 2) 

Gandalf told him they have left him a note on the mantle with terms, and so he ended up rushing out the door before he seemed to know he was doing it.  He left without his handkerchief! I imagine that is a big deal for a hobbit used to comfort, but it would soon become the least of his worries.