Vajra Sutra: All Dharma Are Buddhadharmas

Actually there is not the slightest dharma which can be attained. There is no dharma of unsurpassed, proper and equal, right enlightenment which the Buddha can attain. …

If you force it and say that the Tathagata attains something called Anuttara-samyak-saṃbodhi, that Anuttara-samyak-saṃbodhi is neither true nor false. Being neither true nor false, it is the final meaning of the Middle Way; it is real mark prajña.

Therefore the Tathagata says that although there is no dharma which can be attained, yet all dharma are Buddhadharmas. There is nothing outside the Buddhadharma. Therefore all teachings are Buddhist. They do not go beyond the Buddha’s teaching, because the Buddha’s teaching contains all things. Buddhadharma is the totality of the dharma. Buddhism is the totality of all other teachings. All schools and teachings are born from within the Buddha’s teaching. Since they are all born from Buddhism, in the future they will again return to Buddhism. Therefore it is unnecessary to ask to what religion a person belongs. No matter what school, or sect, or teaching, or religion one believes none goes beyond Buddhism. The essential point is to have faith in something. Then although you may believe various teachings, switching back and forth from this one to that one, in the end you will certainly return to Buddhism. The Buddhadharma is that great. Although it says there is no dharma which can be attained, nonetheless there is not one dharma which is not the Buddhadharma. And since the Buddhadharma is ultimately unattainable, how could a single dharma be attained?

The Vajra Prajna Paramita Sutra, p141-142