The building up of good and evil both involve attachment to form. Suppose a warrior, forgetting that he was already wearing his pearl on his forehead, were to seek for it somewhere else? He could travel the whole world without finding it. But if someone who knew what was wrong were to point it out to him, the warrior would immediately realize that the pearl had been there all the time. So, if you students of the Way are mistaken about your own real Mind, not recognizing that it is the Buddha, you will consequently look for him elsewhere, indulging in various achievements and practices and expecting to attain realization by such graduated practices. But, even after eons of diligent searching, you will not be able to attain to the Way.
Excerpted from “Transmission of the Mind Part II” by Huang Po