Whereas he pretended to be vain, he was actually modest.
Although he insisted that true art springs from moral passion, he rejected the notion that morals do not change.
He considered himself to be the pioneer of a new philosophy, but he hoped his audiences would eventually adopt his point of view.
On the one hand, he held that ideas are a most important part of a work of art; on the other hand, he believed that ideas go out of date.
Refer to these lines in the second paragraph “Shaw, whose essential modesty is as disarming as his pose of vanity is disconcerting”.