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This truth, therefore, [he declares], in order that we may not reject the engrafting of the Spirit while pampering the flesh. "But thou, being a wild olive-tree," he says, "hast been grafted into the good olive-tree, and been made a partaker of the fatness of the olive-tree." ¹ As, therefore, when the wild olive has been engrafted, if it remain in its former condition, viz., a wild olive, it is "cut off, and cast into the fire;" ² but if it takes kindly to the graft, and is changed into the good olive-tree, it becomes a fruit-bearing olive, planted, as it were, in a king's park (paradiso): so likewise men, if they do truly progress by faith towards better things, and receive the Spirit of God, and bring forth the fruit thereof, shall be spiritual, as being planted in the paradise of God. But if they cast out the Spirit, and remain in their former condition, desirous of being of the flesh rather than of the Spirit, then it is very justly said with regard to men of this stamp, "That flesh and blood shall not inherit the kingdom of God;" ³ just as if any one were to say that the wild olive is not received into the paradise of God. Admirably therefore does the apostle exhibit our nature, and God's universal appointment, in his discourse about flesh and blood and the wild olive. For as the good olive, if neglected for a certain time, if left to grow wild and to run to wood, does itself become a wild olive; or again, if the wild olive be carefully tended and grafted, it naturally reverts to its former fruit-bearing condition: so men also, when they become careless, and bring forth for fruit the lusts of the flesh like woody produce, are rendered, by their own fault, unfruitful in righteousness. For when men sleep, the enemy sows the material of tares; ⁴ and for this cause did the Lord command His disciples to be on the watch. ⁵ And again, those persons who are not bringing forth the fruits of righteousness, and are, as it were, covered over and lost among brambles, if they use diligence, and receive the word of God as a graft, ⁶ arrive at the pristine nature of man--that which was created after the image and likeness of God.