Two quotes on presence (mindfulness) by Eckhart Tolle

Do not seek any other state than the one you are in now; otherwise you will set up inner resistance to what is the now. Forgive yourself for not being at peace. The moment you completely accept your non-peace, your non-peace becomes peace. Anything you accept fully will lead you into peace, This is the miracle of surrender. When you accept what is, every moment is the best moment. That is enlightenment.Eckhart Tolle
If you go into a forest with your mind only, you’ll only notice the sounds and the mind will try to interpret them. You might think you’re present; but you’re not really, you’re simply judging what you hear. But if you become aware of the silent dimension underneath the sounds and in between the sounds, then you become present because the moment you become aware of the silence, you also have become silent.Eckhart Tolle

Mindfulness and walking by Eckhart Tolle

If you go into a forest with your mind only, you’ll only notice the sounds and the mind will try to interpret them. You might think you’re present; but you’re not really, you’re simply judging what you hear. But if you become aware of the silent dimension underneath the sounds and in between the sounds, then you become present because the moment you become aware of the silence, you also have become silent.Eckhart Tolle