大乘起信論別記 1.81

1.81

「第四、緣熏習」者，始起圓智，作增上緣，熏眾生心，令起厭樂及諸加行，乃至佛果，故名緣熏。此諸行德，不離圓智，是波智影，故名為鏡。如《佛地經》說「大圓鏡智，能起一切眾生諸善法影。」此之謂也。余二種鏡，義顯可知。

As for "the fourth, the perfuming of conditions," the round wisdom that newly arises acts as a dominant condition to perfume the minds of sentient beings, causing them to give rise to revulsion, delight, and various preparations, up to the fruit of Buddhahood; hence it is named the perfuming of conditions. These virtues of practice are not separate from the round wisdom; they are the reflections of wisdom-waves, and hence it is called a mirror. As the Buddhabhūmisūtra says: "The great round mirror wisdom can give rise to the reflections of all wholesome dharmas of sentient beings." This is what it means. The other two kinds of mirrors are clear in meaning and can be understood.