From HUANG PO

  1. Primordial Mind is like the vast space in which there is no confusion. When the sun rises and illuminates the whole earth, vast space gains not in brilliance and when the sun sets the vast space does not darken. The phenomena of light and dark alternate with each other but the nature of space remains unchanged. So it is with the primordial nature of the Buddha and of sentient beings. If you look upon the Buddha as presenting a pure bright and light appearance, or upon sentient beings as presenting a dark or mortal appearance, these conceptions resulting from attachment to form will keep you from supreme knowledge. There is only the one Mind and not a particle of anything else on which to lay hold for this Mind is the Buddha. If you do not awake to this Mind substance you will overlay Mind with conceptual thought you will seek the Buddha outside yourselves and you will remain attached to forms, pious practices and so on, all of which are not at all the way to supreme knowledge.
  1. Our primordial nature is in the highest truth devoid of any bit of objectivity– it is spacious, in the present, still, pure; it is glorious and mysterious peaceful joy.  Enter deeply into it by awakening to it yourself. … That which is before you and in you is That in all its fullness utterly complete….There is nothing beside.

Even if you go through all the stages of progress one by one, when it last in a single flash you attain full realization you will only be realizing the Buddha nature which has been with you all the time.

  1. If you would spend all your time walking standing sitting or lying down learning to halt the concept forming activities of your own mind you could be sure of ultimately attaining the goal.