Today, the 8th day of the 12th lunar month, is the day
Śākyamuni Buddha accomplished the path to Buddhahood.
Homage to our fundamental teacher Śākyamuni Buddha.
You should now virtuously uphold, and be careful not to forget, that in the past and future, all Buddhas of the three periods, all Buddha World-Honoured Ones, all speak thus, on the Samādhi [i.e. Meditative Concentration] From Mindfulness Of Buddha.
I, and this Auspicious Kalpa’s all great Bodhisattvas, due to the power of Samādhi From Mindfulness Of Buddha thus, attained all-knowing wisdom, and awe-inspiring ease.
Thus did the ten directions’ all immeasurable Buddhas [everywhere], all by this Dharma accomplished [Anuttarā Samyak] Saṃbodhi [i.e. unsurpassable equally perfect enlightenment of Buddhahood].
(The Sûtra In Which The Buddha Speaks Of
The Ocean-like Samādhi From Contemplation Of Buddha)
How Did All Buddhas Attain Buddhahood?