<p><cite class="title text-en" lang="en">The Long Explanation of the Noble Perfection of Wisdom in One Hundred Thousand, Twenty-Five Thousand, and Eighteen Thousand Lines</cite> is a detailed explanation of the Long Perfection of Wisdom sūtras, presenting a structural framework for them that is relatively easy to understand in comparison to most other commentaries based on Maitreya-Asaṅga’s <cite class="title text-en" lang="en">Ornament for the Clear Realizations</cite>. After a detailed, word-by-word explanation of the introductory chapter common to all three sūtras, it explains the structure they also all share in terms of the three approaches or “gateways”‍—brief, intermediate, and detailed‍—ending with an explanation of the passage known as the “Maitreya chapter” found only in the <cite class="title text-en" lang="en">Eighteen Thousand Line</cite> and <cite class="title text-en" lang="en">Twenty-Five Thousand Line</cite> sūtras. It goes by many different titles, and its authorship has never been conclusively determined, some Tibetans believing it to be by Vasubandhu, and others that it is by Daṃṣṭrāsena.</p>