Focusing on the now is not the same as being present in the now. Narrowing focus is a mental (mind-based) activity that takes you out of the present and into thought. Being present contains no thinking at all. When you disengage your mind from activity, present moment awareness is clearest. If you must focus on anything, focus on not focusing! In other words, clear your mind and simply BE in the moment; you’ll never be more clear.
