 Vasubandhu did the work of defending the controversial, Yogācāra thesis of appearance-only (vijñaptimātra) in his Twenty Verses. In his short, poetic works the Thirty Verses and the Three Natures Exposition, he does not entertain  objections.[40]  Instead, he draws together the basic doctrinal and conceptual vocabulary of the Yogācāra tradition and forms an elegant, coherent system. The Thirty Verses includes a complete treatment of the Buddhist path from a Yogācāra perspective. In order to understand Vasubandhu’s contribution in this text, it would be necessary to place it against the wide backdrop of previous Yogācāra doctrine. This scholarly work is ongoing. Here, let us focus instead on introducing the basics of the intricate doctrinal structure formulated in the Three Natures Exposition.