According to Zen master Keizan's Denkoroku, Ananda spent 20 years at the Buddha's side. He had a perfect memory, understood all the teachings, was an impeccable practitioner, and attained arhatship. Despite this, the Buddha made Kashyapa his Dharma heir, and Ananda spent another 20 years practicing with Kashyapa. Finally, Ananda asked Kashyapa, "What am I missing?" This chapter of the Denkoroku discusses their subsequent exchange and Ananda's long-awaited awakening.