All Buddhas’ Essential Dharma
This one recitation of Āmítuófó, is the same as that our fundamental teacher Śākyamuni Buddha, in this Five Defilements’ Evil Period’s attained Anuttara Samyak Saṃbodhi’s Dharma. Now with this fruit of awakening’s entire essence conferred to defiled and evil sentient beings, it is thus of the realm that all Buddhas practise, that only Buddhas with Buddhas are able to understand completely, not that the nine realms’ beings with their Self-Power are able to have faith and understanding of by themselves.
– Pure Land Tradition’s 9th Patriarch Great Master Ǒuyì
(Essential Explanation Of The Sūtra In Which The Buddha Speaks Of Amitābha Buddha)
That Practised By All Buddhas & Bodhisattvas
How Did Śākyamuni Buddha Attain Buddhahood?
 Āmítuófó Is The Dharma From The Fruit Of Buddhahood