Sentence:  The imagination, therefore, must furnish to religion and to metaphysics those large ideas tinctured with passion, those <WSD>supersensible</WSD> forms shrouded in awe, in which alone a mind of great sweep and vitality can find its congenial objects. 
Meaning of the word marked with <WSD> tags:  Beyond the range of what is perceptible by the senses; not belonging to the experienceable physical world.