How does Hans Castorp (Thomas Mann) try to achieve the humanist ideal of humanity by delving into medical, biological, and astronomical books?

Select Castorp’s experiences which you believe may be considered as the most significant milestones on his journey toward greater self-awareness. Be specific and back up your choices.
How does Hans Castorp (Thomas Mann) try to achieve the humanist ideal of humanity by delving into medical, biological, and astronomical books?