At the opening of the Benkenmitsu Nikyōron, Kūkai says that exoteric teaching takes the practice of the Six Perfections as its core and completes buddhahood over three immeasurable eons. He sets esoteric teaching apart from it as the teaching in which the dharmakāya Buddha himself expounds the gate of the Three Mysteries of body, speech, and mind. Through the Three Mysteries, uniting one’s own body, speech, and mind with the Buddha’s, the practitioner walks the path of attaining buddhahood in this very body.
In his Hannya Shingyō Hiken, Kūkai reads recitation and contemplation of the mantra as a way to remove ignorance and realize Dharma in this very body. Wisdom appears in voice, posture, and attention.
At Byodoji, the Paramitas can begin with ordinary acts: offering, cleaning, stopping a harmful word, continuing a short liturgy, and returning the mind to the Buddha with joined palms.