Without a development or training of the mind, we find that much of our life is lost in thoughts and that we take these thoughts to be reality. How often do our thoughts condition reactions in the mind, as though the thought itself had substance? Yet the thought of a friend is not the friend; it is a thought. How many life scenarios have we created, directed and starred in and, for those moments, taken to be the experience itself? We also may get carried away by the intense nature of our emotions, swept up in a typhoon of the mind and body. To be lost in emotions is not to be mindful of their energy; and when there is a strong identification with them, there is no space in our mind for seeing clearly what is happening.
Joseph Goldstein and Jack Kornfield, Seeking the Heart of Wisdom




