The 'Thirty Verses' or 'Treatise on the Thirty Verses on No More Nor Less than Representation Only' by Vasubandhu (316 - 396), is a succinct and concentrated set of thirty verses crucial to the Yog_c_ra, the second branch of the Mah_y_na. Yog_c_ra is, next to Madhyamaka or __nyav_da (initiated by N_g_rjuna), one of the two schools of Mah_y_na, integrating yoga and epistemology. It became canonical and was translated into Chinese, forming the heart of the 'Treatise on the Establishment of the Doctrine of Consciousness-Only', a major 7th century work of Xuanzang (602 - 664). In this work, the thoughts of Vasubandhu were turned into an ontological idealism, i.e. the subject constitutes the object. The commentary avoids this common take on Vasubandhu and returns to his original approach: a critical and phenomenological Yog_c_ra ('yoga practice' or 'one whose practice is yoga'), also called 'citta-m_tra', Consciousness-Only. The text is translated from Sanskrit into English and French.