3970. CONCERNING A BLACK HORSE. There are spirits who desire to possess all things, and yet are unable to determine themselves to the possession of anything; and there are those who desire to know everything, and yet do not determine themselves to the acquisition of knowledge. They barely desire to have, and desire to know, but they neither have anything nor know anything. Such spirits ran to and fro through my memory, prompted by this kind of impulse, but they were averse to fixing upon anything or to receiving delight from any specific object, such as the palaces, pictures, and the like, which I had seen in cities; nor could they concentrate their view upon anything definite [certum]; they simply ran, as it were, back and forth [through my mind], desiring everything, but yet influenced only by a vague cupidity.