For the ego to survive, it must make time -- past and future -- more important than the present moment. The ego cannot tolerate becoming friendly with the present moment, except briefly just after it got what it wanted. But nothing can satisfy the ego for long. As long as it runs your life, there are two ways of being unhappy. Not getting what you want is one. Getting what you want is the other.

Eckhart Tolle

from A New Earth: Awakening to Your Life's Purpose