None of us need ever fear that we don't have an active imagination, because imagination is mostly a willingness to entertain a strange idea now and then.

There are enough ideas, images, symbols, and experiences in your head already to work with for a lifetime. It's a little like having a car with an unpredictable battery, though. Sometimes you get in and it starts right up. Other times, especially if it has been sitting idle for awhile, you turn the key and nothing happens.