4. But if these views should not appear to fill the minds of those who hope for such results with a becoming desire, let us go back a little, and, irrespective of the natural and innate longing of the mind for the thing itself, let us make inquiry so that we may be able at last to describe, as it were, the very forms of the bread of life, and the quality of that wine, and the peculiar nature of the principalities, all in conformity with the spiritual view of things.[338] Now, as in those arts which are usually performed by means of manual labour, the reason why a thing is done, or why it is of a special quality, or for a special purpose, is an object of investigation to the mind,[339] while the actual work itself is unfolded to view by the agency of the hands; so, in those works of God which were created by Him, it is to be observed that the reason and understanding of those things which we see done by Him remains undisclosed. And as, when our eye beholds the products of an artist’s labour, the mind, immediately on perceiving anything of unusual artistic excellence, burns to know of what nature it is, or how it was formed, or to what purposes it was fashioned; so, in a much greater degree, and in one that is beyond all comparison, does the mind burn with an inexpressible desire to know the reason of those things which we see done by God. This desire, this longing, we believe to be unquestionably implanted within us by God; and as the eye naturally seeks the light and vision, and our body naturally desires food and drink, so our mind is possessed with a becoming and natural desire to become acquainted with the truth of God and the causes of things. Now we have received this desire from God, not in order that it should never be gratified or be _capable_ of gratification; otherwise the love of truth would appear to have been implanted by God into our minds to no purpose, if it were never to have an opportunity of satisfaction. Whence also, even in this life, those who devote themselves with great labour to the pursuits of piety and religion, although obtaining only some small fragments from the numerous and immense treasures of divine knowledge, yet, by the very circumstance that their mind and soul is engaged in these pursuits, and that in the eagerness of their desire they outstrip themselves, do they derive much advantage; and, because their minds are directed to the study and love of the investigation of truth, are they made fitter for receiving the instruction that is to come; as if, when one would paint an image, he were first with a light pencil to trace out the outlines of the coming picture, and prepare marks for the reception of the features that are to be afterwards added, this preliminary sketch in outline is found to prepare the way for the laying on of the true colours of the painting; so, in a measure, an outline and sketch may be traced on the tablets of our heart by the pencil of our Lord Jesus Christ.