Namkhai Norbu said this quote

Someone who begins to develop an interest in the teachings can tend to distance themselves from the reality of material things, as if the teachings were something completely apart from daily life. Often, at the bottom of all this, there is an attitude of giving up and running away from one's own problems, with the illusion that one will be able to find something that will miraculously help one to transcend all that. But the teachings are based on the principle of our actual human condition. We have a physical body with all its various limits: each day we have to eat, work, rest, and so on. This is our reality, and we can't ignore it.

~ Namkhai Norbu

But karma is not in fact a material accumulation, and does not depend on externals; rather its power to condition us depends on the obstacles that impede our knowledge. If we compare our karma and the ignorance that creates it to a dark room, knowledge of the primordial state would be like a lamp, which, when lit in the room, at once causes the darkness to disappear, enlightening everything. In the same way, if one has the presence of the primordial state, one can overcome all hindrances in an instant.

~ Namkhai Norbu

To produce a primary [karmic] cause which is potentially capable of having an effect, three things are necessary: intention, the actual action, and then satisfaction.

~ Namkhai Norbu

The light of the sun is the manifestation of the clarity of the sky; and the sky is the basic condition necessary for the manifestation of the sun's light. So, too, in the sky two, three, four, or any number of suns could arise; but the sky always remains indivisibly one sky. Similarly, every individual's state of presence is unique and distinct, but the void nature of the individual is universal, and common to all beings.

~ Namkhai Norbu