“Rejoicing” is the joy which one experiences when the significance of the Sutra first sinks in like a ray of light. When this ray of light first illuminates our soul, we have not yet undertaken any profound studies or done any difficult practices. But the merits of that first moment of joy are greater than those of any other practices we may undertake later. It is the hinge upon which everything else turns. This is the essential and most important point of [Chapter 18, The Merits of a Person Who Rejoices at Hearing This Sutra]. Faith is simple; it is also decisive.
Introduction to the Lotus Sutra