The universe is the physical manifestation of other's wills. Thus, for a person to denigrate the universe is to ignore the personal power of those around them. This is not only disrespectful, it is dangerous.
A follower of the Forgotten Shadow must develop his personal power in order to exert his will on the universe, but seeking too much power too quickly puts him in conflict with other, stronger beings.
Only a foolish follower seeks to challenge his superiors right away. Showing respect ensures a measure of self-protection