So that while we are outside of the promised land, we should not be able to cultivate such trees; and this is very natural;

for as long as the mind has not entered upon the path of wisdom, but turns aside and wanders out of the road, it cares only for the trees which do not admit of being cultivated or used for food of men—trees which are barren and useless, and which, though they bear, bear no fruit which is eatable.

But when the mind, having entered upon the path of Leviticus xix. 23. wisdom, marches along with its doctrines, and begins to keep pace with them all, it then cultivates the useful trees, which are capable of bearing eatable fruit, instead of caring for those useless kinds; it cultivates a mastery over, instead of the indulgence of the passions, and knowledge instead of ignorance, and good instead of evil.

Since therefore he who is led into the path of virtue is still at a long distance from the end, it is very naturally laid as an injunction upon the man who plants, to remove the uncleanness of that which is planted. And what this is, we will now consider.