All Buddhas preach emptiness. Why? Because they wish to crush the concrete ideas of the students. If a student even clings to an idea of emptiness, he betrays all Buddhas.
BodhidharmaUnless you see your nature, you shouldn't go around criticizing the goodness of others. There's no advantage in deceiving yourself. Good and bad are distinct. Cause and effect are clear. But fools don't believe and fall straight into a hell of endless darkness without even knowing it. What keeps them from believing is the heaviness of their karma. They're like blind people who don't believe there's such a thing as light. Even if you explain it to them, they still don't believe, because they're blind. How can they possibly distinguish light?
BodhidharmaIf you know that everything comes from the mind, don't become attached. Once attached, you're unaware. But once you see your own nature, the entire Canon becomes so much prose. It's thousands of sutras and shastras only amount to a clear mind. Understanding comes in midsentence. What good are doctrines? The ultimate Truth is beyond words. Doctrines are words. They're not the Way. The Way is wordless. Words are illusions. . . . Don't cling to appearances, and you'll break through all barriers. . . .
BodhidharmaBut people of the deepest understanding look within, distracted by nothing. Since a clear mind is the Buddha, they attain the understanding of a Buddha without using the mind.
Bodhidharma