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Make it a habit to ask yourself: What's going on inside me at this moment? That question will point you in the right direction. But don't analyze, just watch. Focus your attention within. Feel the energy of the emotion. If there is no emotion present, take your attention more deeply into the inner energy field of your body. It is the doorway into Being.

Eckhart Tolle (2010). “The Power of Now: A Guide to Spiritual Enlightenment”, p.27, New World Library
Make it a habit to ask yourself: What's going on inside me at this moment? That question will point you in the right direction. But don't analyze, just watch. Focus your attention within. Feel the energy of the emotion.