Here's another excellent brief teaching from Sogyal Rinpoche (author of "The Tibetan Book of Living and Dying" - which would be good for each of us to read!
This, from Sogyal Rinpoche.
As you continue to practice meditation, you may have all kinds of experiences, both good and bad. You might experience states of bliss, clarity, or absence of thoughts. In one way these are very good experiences, and signs of progress in meditation. For when you experience bliss, it’s a sign that desire has temporarily dissolved. When you experience real clarity, it’s a sign that aggression has temporarily ceased. When you experience a state of absence of thought, it’s a sign that your ignorance has temporarily died. By themselves they are good experiences, but if you get attached to them, they become obstacles.
Experiences are not realization in themselves; but if we remain free of attachment to them, they become what they really are—that is, materials for realization.