His mind plunged like a colt in a happy pasture, and when later the world put up fences he plunged against the wire, and when the final stockade surrounded him, he plunged right through it and out.

East of Eden
By John Steinbeck

"Tom, the third son, was most like his father. He was born in fury and he lived in lightning. Tom came headlong into life. He was a giant in joy and enthusiasms. He didn't discover the world and its people, he created them. When he read his father's books, he was the first. He lived in a world shining and fresh and as uninspected as Eden on the sixth day. His mind plunged like a colt in a happy pasture, and when later the world put up fences he plunged against the wire, and when the final stockade surrounded him, he plunged right through it and out. And as he was capable of giant joy, so did he harbor huge sorrow, so that when his dog died the world ended.
Tom was as inventive as his father but he was bolder. He would try things his father would not dare. Also, he had a large concupiscence to put the spurs in his flanks, and this Samuel did not have. Perhaps it was his driving sexual need that made him remain a bachelor. It was a very moral family he was born into. It might be that his dreams and his longing, and his outlets for that matter, made him feel unworthy, drove him sometimes whining into the hills. Tom was a nice mixture of savagery and gentleness. He worked inhumanly, only to lose in effort his crushing impulses."
(p. 40)