The greatest problems lie in the mind. They remain long, and are tough to solve.
Imagination is a playful mind. Such playfulness needs to remain within the boundaries of sanity. If the boundaries are crossed, we slide into the arms on insanity. It could manifest in deep anxiety, or depression.
Imagination is good fun. You can often enjoy in your mind, what you can't in reality.
This same imagination can be very painful when the devil enters. Suddenly, we imagine such deep fear, and negativity where in reality none exists. The pain caused by a wild, negative imagination surpasses most other pain.
We suffer more in imagination than in reality.