For God has implanted in the mind a power of comprehending that world, which is appreciable only by the intellect, by its own power, but the invisible world by means of the external senses. And if any one were able in all his parts to live to God rather than to himself, looking by means of the external senses into those things which are their proper objects, for the sake of finding out the truth; and through the medium of the soul, investigating in a philosophical spirit the proper objects of intelligence, and those things which have a real existence, and by means of his organs of voice, singing hymns in praise of the world and of its Creator, he will have a happy and a blessed life.
 I think then that this is what intimated in the words, "Take for me;" God, intending to send down the perfection of his divine virtue from heaven to earth, out of pity for our race, in order that it might not be left destitute of a better portion, prepared in a symbolical manner the sacred tabernacle and the things in it, a thing made after the model and in imitation of wisdom. For he says that he has erected his oracle as a tabernacle in the midst of our impurity, in order that we may have something whereby we may be purified, washing off and cleansing all those things which dirt and defile our miserable life, full of all evil reputation as it is.
Let us now then see in what manner he has commanded us to bring in the different things which are to contribute to the furnishing of the tabernacle. "The Lord," says the scripture, "spake unto Moses saying, Speak unto the children of Israel, and take ye first-fruits for me of whatever it shall seem good to your heart to take my first-fruits." Exodus xxv. 1. Therefore here also there is an injunction to take not for themselves but for God, examining who it is who gives these things, and doing no injury to what is given, but preserving it free from danger, and free from spot, perfect and entire. And the injunction, by which he orders the first fruits to be offered to himself, is full of doctrine; for in real truth the beginnings both of bodies and of things are investigated with reference to God alone; and search if you wish to understand everything, plants and animals, and arts and sciences.
Are then the first castings of the seed of plants, the actions

 Exodus xxv. 1. 
 
of husbandry or the invisible works of invisible nature? What more need I ask? What are the works of men and other animals? Have not they parents as co-operating causes, as it were, and also nature as the primary and more important and real cause?