"Have you ever stared into the eyes of a religious fanatic?"
Qui-gon thinks of his padawan when he talks about the will of the force. The boy's eyes light up with the burning blue flame of unconditional faith and dedication. Even though, as a jedi, he himself has vowed to be an unwavering servant of the Force, the reverent clarity with which Obi-wan speaks of duty and sacrifice often frightens him.
There is an absolute quality of the boy's connection that can be likened to a black hole; all things are nothing before the Force and its will.
He turns to the questioner and without hesitation, answers "Yes."