Another of humanity’s early awakened teachers emerged in China. His name was Lao Tzu. He left a record of his teaching in the form of one of the most… - Eckhart Tolle

You think that your attention is in the present moment when it's actually taken up completely by time. You cannot be both unhappy and fully present in the Now. What you refer to as your "life" should more accurately be called your "life situation." It is psychological time: past and future. Certain things in the past didn't go the way you wanted them to go. You are still resisting what happened in the past, and now you are resisting what is. Hope is what keeps you going, but hope keeps you focused on the future, and this continued focus perpetuates your denial of the Now and therefore your unhappiness. p. 43

The form of this book can be seen as a revival for the present age of the oldest form of recorded spiritual teachings: the sutras of ancient India. Sutras are powerful pointers to the truth in the form of aphorisms or short sayings, with little conceptual elaboration. The Vedas and Upanishads are the early sacred teachings recorded in the form of sutras, as are the words of the Buddha. The sayings and parables of Jesus, too, when taken out of their narrative context, could be regarded as sutras, as well as the profound teachings contained in the Tao Te Ching, the ancient Chinese book of wisdom. The advantage of the sutra form lies in its brevity... (intro)

Whatever you accept completely will take you to peace, including the acceptance that you cannot accept, that you are in resistance. (Ch 6)