In one of your readings - the one that says 'Rebel-Seeker' at the top of the page - we are told that Hesse "was favorably impressed by Lao-Tse" and "became a passionate advocate of Chinese thought and belief" (Mileck 161).
I was looking at the Tao Te Ching recently and found a few excerpts whose sentiments and ideas Siddhartha seems to echo. I've included one example below, for your perusal and mystification.
"Be done with knowing and your worries
How much difference is there between yes and no?
How much distinction between good and evil?
Fearing what others fear, admiring
what they admire -
Conventional people are jolly and reckless,
feasting on worldly things and carrying
on as though every day were the
beginning of spring.
I alone remain uncommitted, like an
infant who hasn't yet smiled:
lost, quietly drifting, unattached
to ideas and places and things."
(Walker, Brian Browne. The Tao Te Ching of Lao Tze. New York: St. Martin's Press, 1995.)