Conceptual mind takes the nonexistent and makes it existent. It takes things that have already ceased and makes them exist now. It takes that which has not yet been produced, that which will arise only in the future, and brings it into the present. As for what does arise in the present moment, as soon as it arises, it ceases. Immediately upon having arisen, it is gone. But thinking mind takes that and keeps it hanging around as if it were some kind of a thing, a hard and solid thing. That is the activity of conceptuality.
--From A Course on View: The Two Truths in the Three Yanas and the Mahayana Philosophical Traditions, Rocky Mountain Dharma Center, Summer 1991. Translated by Jules Levinson (edited for the KTGR Quotes Archive by Ari Goldfield).
Know this life to be like a dream. See the mind’s unborn nature. Aspire to be of benefit to others.