Shepard doesn't reply. He / she hesitates. Javik senses the doubt in Shepard, and tells him / her that his / her silence is the answer to his question.
Sorry to be a prick, but if you're gonna do the "full quote" you should probably get it right.
Time passes, people move. Like a river’s flow, it never ends. A childish mind will turn to noble ambition. Young love will become deep affection. The clear water’s surface reflects growth.
-Sheik I posted this on another one too, but oh well