<p style='text-align: justify;'>The <i>Tattvārthādhigamasūtra</i> by Umāsvāti is the most fundamental extra-canonical jaina treatise. It is the earliest religious scripture recognised as authoritative by both the <i>Śvetāmbara</i> and the <i>Digambara</i> sects (although in two slightly divergent recensions).</p>