XVII. (56) “And God caused to rise out of the earth every tree which is pleasant to the sight and good for food, and the tree of life he raised in the middle of the Paradise, and also the tree of the knowledge of good and evil.” He here gives a sketch of the trees of virtue which he plants in the soul. And these are the particular virtues, and the energies in accordance with them, and the good and successful actions, and the things which by the philosophers are called fitting; (57) these are the plants of the Paradise. Nevertheless, he describes the characteristics of these same trees, showing that that which is desirable to be beheld is likewise most excellent to be enjoyed. For of the arts some are theoretical and not practical, such as geometry and astronomy. Some, again, are practical and not theoretical, such as the art of the architect, of the smith, and all those which are called mechanical arts. But virtue is both theoretical and practical; for it takes in theory, since the road which leads to it is philosophy in three of its parts–the reasoning, and the moral, and the physical part. It also includes action; for virtue is art conversant about the whole of life; and in life all actions are exhibited. (58) Still, although it takes in both theory and practice, nevertheless it is most excellent in each particular. For the theory of virtue is thoroughly excellent, and its practice and observation is a worthy object to contend for. On which account Moses says that the tree was pleasant to the sight, which is a symbol of theoretical excellence; and likewise good for food, which is a token of useful and practical good.
XVIII. (59) But the tree of life is that most general virtue which some people call goodness; from which the particular virtues are derived, and of which they are composed. And it is on this account that it is placed in the centre of the Paradise; having the most comprehensive place of all, in order that, like a king, it may be guarded by the trees on each side of it. But some say that it is the heart that is meant by the tree of life; since that is the cause of life, and since that has its position in the middle of the body, as being, according to them, the dominant part of the body. But these men ought to be made aware that they are expounding a doctrine which has more reference to medical than to natural science. But we, as has been said before, affirm that by the tree of life is meant the most general virtue. (60) And of this tree Moses expressly says, that it is placed in the middle of the paradise; but as to the other tree, that namely of the knowledge of good and evil, he has not specified whether it is within or outside of the Paradise; but after he has used the following expression, “and the tree of the knowledge of good and evil,” he says no more, not mentioning where it is placed, in order that any one who is uninitiated in the principles of natural philosophy, may not be made to marvel at his knowledge. (61) What then must we say? That this tree is both in the Paradise and also out of it. As to its essence, indeed, in it; but as to its power, out of it. How so? The dominant portion of us is capable of receiving everything, and resembles wax, which is capable of receiving every impression, whether good or bad. In reference to which fact, that supplanter Jacob makes a confession where he says, “all these things were made for Me.”{12}{#ge 42:36.} For the unspeakable formations and impression of all the things in the universe, are all borne forward into, and comprehended by the soul, which is only one. When, therefore that receives the impression of perfect virtue, it has become the tree of life; but when it has received the impression of vice, it has then become the tree of the knowledge of good and evil, and vice and all evil have been banished from the divine company. Therefore the dominant power which has received it is in the Paradise according to its essence; for there is in it that characteristic of virtue, which is akin to the Paradise. But again, according to its power it is not in it, because the form of virtue is inconsistent with the divine operations; (62) and what I here say, any one may understand in this manner. At this moment, the dominant part is in my body, according to its essence, but according to its power it is in Italy, or Sicily, when it applies its consideration to those countries, and in heaven when it is contemplating the heaven. On which principle it often happens that some persons who are in profane places, according to their essence, are in the most sacred places, thinking of those things which relate to virtue. And again, others who are in the temples of the gods, and profane in their minds, from the fact of their minds receiving a change for the worse, and evil impressions; so that vice is neither in the Paradise, nor not in it. For it is possible that it may be in it according to its essence, but it is not possible that it should be according to its power.
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