Eckhart Tolle's Guide for Living in the Now

1. The past has no power over the present moment.
2. Now is all there is; there is no past or future except as memory or anticipation in your mind.
3. The primary cause of unhappiness is never the situation but your thoughts about it. Be aware of the thoughts you are thinking. Separate them from the situation, which is always neutral. It is as it is.
4. Sometimes letting things go is an act of far greater power than defending or hanging on.
5. Acknowledging the good that you already have in your life is the foundation for all abundance.
6. Life isn't as serious as the mind makes it out to be.
7. Whatever you fight, you strengthen, and what you resist, persists.
8. Worry pretends to be necessary but serves no useful purpose.
9. Always say "yes" to the present moment. What could be more futile, more insane, than to create inner resistance to what already is? What could be more insane than to oppose life itself, which is now and always now? Surrender to what is. Say "yes" to life - and see how life suddenly starts working for you rather than against you.
10. Any action is often better than no action, especially if you have been stuck in an unhappy situation for a long time. If it is a mistake, at least you learned something, in which case it's no longer a mistake. If you remain stuck, you learn nothing.
11. Awareness is the greatest agent for change.
12. That in you which recognizes madness as madness(even if it is your own) is sanity, is the arising awareness, is the end of insanity.
13. Instead of asking, "What do I want from life?," a more powerful question is, "What does life want from me?"
14.Wherever you are, be there totally. If you find your here and now intolerable and it makes you unhappy, you have three options: remove yourself from the situation, change it, or accept it totally. If you want to take responsibility for your life, you must choose one of those three options, and you must choose now. Then accept the consequences.
15. Life will give you whatever experience is most helpful for the evolution of your consciousness. How do you know this is the experience you need? Because this is the experience you are having at the moment.
16. There is a fine balance between honoring the past and losing yourself in it. For example, you can acknowledge and learn from mistakes you made, and then move on and refocus on the now. It is called forgiving yourself.
17. If not now, when?

Enjoy!

Sources:
Tolle, E. (n.d.). Retrieved May 23, 2015, from http://www.goodreads.com/works/quotes/840520-the-power-of-now

Eckhart Tolle Quotes. (n.d.). Retrieved May 23,2015 from http://www.goodreads.com/author/quotes/4493.Eckhart_Tolle

Books by Eckhart Tolle:
The Power of Now: A guide to Spiritual Enlightenment
A New Earth: Awakening to Your Life's Purpose