John of Damascus

For God says, "Of every tree of paradise you shall eat," meaning, I think, by means of all created things you will be drawn up to me, their Creator, and from them reap the one fruit which is myself, who am the true life. Let all things be fruitful life to you, and make participation in me to be the substance of your own existence, for thus you shall be immortal.

The tree of knowledge of good and evil is the power of discernment by multidimensional vision. This is the complete knowing of one's own nature. Of itself it manifests the magnificence of the Creator, and it is good for them that are fullgrown and have walked in the contemplation of God—for them that have no fear of changing, because in the course of time they have acquired a certain habit of such contemplation. It is not good, however, for such as are still young and are more greedy in their appetites, who, because of the uncertainty of their perseverance in the true good and because of their not yet being solidly established in their application to the only good, are naturally inclined to be drawn away and distracted by their solicitude for their own bodies.

Some have imagined paradise to have been material, while others have imagined it to have been spiritual. However, it seems to me that just as man was created both sensitive and intellectual, so did this most sacred domain of his have the twofold aspect of being perceptible both to the senses and to the mind. For while in his body he dwelt in this most sacred and superbly beautiful place, as we have related, spiritually he resided in a loftier and far more beautiful place. There he had the indwelling God as a dwelling place and wore him as a glorious garment. He was wrapped about with his grace, and like some one of the angels he rejoiced in the enjoyment of that one most sweet fruit which is the contemplation of God, and by this he was nourished. Now this is indeed what is fittingly called the tree of life, for the sweetness of divine contemplation communicates a life uninterrupted by death to them that partake of it.