“In order for our perceptions to be clear, we must eliminate all the faults that prevent us from seeing things the way they are. The obstacles are imprints left by such delusions as desire, anger, pride and ignorance. Even after the delusions have been eliminated, the mind retains their imprints. But because the true nature of the mind is clear, pure, and knowing, it is possible to purify the mind thoroughly and attain that clarity of awareness.”

The Way to Freedom: Core Teachings of Tibetan Buddhism,   by H.H. The Dalai Lama. This is an excellent resource for anyone seeking clarity.