in reference to which it is also commanded in the law which was established in cases of leprosy, that "the man who was not infected with any variation of colour, but who was white all over from the head to the extremity of his feet, should be pure." Leviticus xiii. 12. In order that, according to the similitude of the body, those who have discarded the crafty, and unscrupulous, and ambiguous, and uncertain disposition of mind, may embrace the simple, uncoloured, unambiguous, plain complexion of truth; therefore, to say that the tree is purified, contains a principle, the assertion of which is founded surely in truth, but to make the same statement with respect to the fruit is saying what
 Numbers v. 15. 
 Leviticus xix. 23. 
 Genesis xxx. 37. 
 Leviticus xiii. 12. 
 
is not equally clear or credible; for no cultivator of figs or grapes, or, in sort, of any fruit whatever, purifies them.
 And again Moses says, "Its fruit shall be impure for three days, it shall not be eaten;" Leviticus xix. 23. as if in fact it were customary for it to be purified for ever. We must, therefore, say that this is one of those expressions which have a concealed meaning, since the words themselves are not quite consistent with it; for the expression is an ambiguous one; for it bears one sense of this kind, the fruit shall remain for three years; and then there is a distinct injunction, "it shall not be eaten before it is purified." But there is also another meaning, "the fruit of the tree shall for three years be unpurified, and while in that state it shall not be eaten." According, then, to the former statement one may understand it in this manner: the three years being taken for time which is divided into three portions; for it is the nature of time to be divided into the past, the present, and the future; therefore the fruit of education will exist, and will endure, and will last unimpaired through all the divisions of time, a statement equivalent to—it will never receive any corruption, for the nature of good is imperishable.
But the fruit which is not purified shall not be eaten; inasmuch as virtuous reasons, duly purified and rendered sound, nourish the soul, and give vigour to the mind; but the opposite kinds are not nutritious, but bring disease and destruction on the soul.
 According to the other meaning, as in the disputes of dialecticians, the word "undemonstrated" is used in a double sense, either of a proposition which it is hard to demonstrate by reason of its difficulty, or of one which is intrinsically so plain as to require no demonstration, and the truth of which is established not by the testimony of any one else, but by its own internal evidence. So also fruit may be understood as not being purified, either when it is so impure as to be difficult to purify, or when it requires no purification, but is bright, and clear, and pure of itself.