The mind can only think old thoughts. Things that it has learned and thought before. To think new thoughts, to have great insights, you must go outside the mind. You must stop thinking. When you stop thinking, then you allow the timeless consciousness in. The timeless consciousness is not bound by old, limited thought patterns.
How to stop thinking? Easy. Simply shift your attention. Focus your attention on your breathing. Focus on the inhalation and then the exhalation. You can’t think when you’re focused on your breathing. Do this for one or two breaths. Then resume work on your problem. You may very well find that you suddenly have a new insight.
— This is a synopsis of some of the neat things that I have learned from Eckhart Tolle.