Motivation included purifying the mind of any past disturbances, anything that might cast a shadow on the pure perception of luminous emptiness. It's not helpful to simply say, Everything is essentially empty, everything is essentially pure. Although that happens to be absolutely true, in order to know this absolute truth from the inside out, we must work with those thorns that cannot be plucked through intellectual reasoning or dharma philosophy. To be effective, working with subtle knots of guilt and remorse must be embodied experiences. Furthermore, these knots prevent the full expression of our compassion. In subtle ways, they keep us stuck on ourselves and hold us back from giving everything we have to the welfare of others.
— Yongey Mingyur Rinpoche
from In Love with the World: A Monk's Journey Through the Bardos of Living and Dying