The eight lower levels have intellectually fabricated and contrived that which is changeless solely due to fleeting thoughts that never experience what truly is. They apply antidotes to and reject that which is not to be rejected. They refer to as flawed that in which there is nothing to be purified, with a mind that desires purification. They have created division with respect to that which cannot be obtained by their hopes and fears that it can be obtained elsewhere. And they have obscured wisdom, which is naturally present, by their efforts in respect to that which is free from effort and free from needing to be accomplished. Therefore, they have had no chance to make contact with genuine, ultimate reality as it is (rnal ma'i de kho na nyid).
— Dudjom Jigdral Yeshe Dorje emphasizing the eight lower vehicles are intellectually fabricated and contrived