The Mahayana emphasizes the need to understand the complete nature of all phenomena. It is a view of “wholeness.” Ordinarily, the mind merely connects with appearances: the appearance of forms, sounds, thoughts, feelings, and so on. We then make assumptions based on how things appear, how they sound, how they feel. This is a very subtle moment: this moment of grasping at some impression, clinging to it, and in that grasping and clinging, immediately articulating an assumption.
Simply put: you do not take time to fully understand what you see, hear, think, or feel. Your understanding arises from fleeting moments that can only produce assumptions, all of which are based on what you stand to gain or lose in the moment. This builds up sediments of deluded perception, through which you cannot see things clearly.
It is not the sights, sounds, thoughts, and feelings that are deluded; you
create delusions, through the speed of making biased assumptions. When the mind has no time to open up to the wholeness, or completeness, of appearances, the sediment of delusion settles into “good” and “bad” assumptions. And at that point, every form, sound, thought, and other sensation you relate is dominated by ego’s personal preferences and convenience.
An Introduction to Ngöndro
Mindrolling Jetsün Khandro Rinpoche