XXI.  The truth then, and the whole Word is full of difficulty and obscurity; and as it were with a small instrument we are undertaking a great work, when with merely human wisdom we pursue the knowledge of the Self-existent, and in company with, or not apart from, the senses, by which we are borne hither and thither, and led into error, we apply ourselves to the search after things which are only to be grasped by the mind, and we are unable by meeting bare realities with bare intellect to approximate somewhat more closely to the truth, and to mould the mind by its concepts.