"If someone is determined to reach enlightenment, what is the most essential method he can practice?

The most essential method, which includes all other methods is beholding the mind….

When a great bodhisattva delves deeply into perfect wisdom, he realizes that the four elements and five shades are devoid of a personal self. And he realizes that the activity of his mind has two aspects: pure and impure. By their very nature, these two mental states are always present. They alternate as cause or effect depending on conditions, the pure mind delighting in good deeds, the impure mind thinking of evil. Those who aren’t affected by impurity are sages. They transcend suffering and experience the bliss of nirvana. All others, trapped by the impure mind and entangled by their own karma, are mortals. They drift through the three realms and suffer countless afflictions, and all because their impure mind obscures their real self."

 

The Zen Teaching of Bodhidharma, trans. By Red Pine, p.77-79