The worth is in the act. Your worth halts when you surrender the will to change and experience life.
Interesting lines, from a book called Eragon by Christopher Paolini that I'm currently reading. Its a really engrossing read - refreshingly interesting and well written. The book is part one of a trilogy. Surprisingly for a book containing such existential lines, the author is 22 years old and started writing the book when he finished high school.