If you don't live the Tao you fall into assertion or denial. Asserting that the world is real, you are blind to its deeper reality - denying that the world is real you are blind to the selflessness of all things
Why does the mind habitually deny or resist the Now? Because it cannot function and remain in control without time, which is past and future, so it perceives the timeless Now as threatening. Time and mind are in fact inseparable.