觀因緣門第一
Chapter 1: The Gate of Observing Conditions
有玄義已入大科,餘未盡者五意釋之。一釋名門、二次第門、三根本門、四有無門、五同異門。
Having explained the profound meaning, we now enter the main outline. The remaining points are clarified through five aspects: first, the explanation of names; second, the sequence; third, the fundamental principles; fourth, the existence or non-existence; fifth, the similarities and differences.