572. That they should kill the third part of men, signifies of depriving themselves of all understanding of truth, and thus of spiritual life. This is evident from the signification of "to kill," as being to deprive of spiritual life (See above, n. 547); and from the signification of "men," as being the understanding of truth (See also above, n. 546, 547); "the third part," in reference to truths, means all (See above, n. 506); so here "to kill the third part of men" signifies the deprivation of all understanding of truth. It means to deprive themselves, because those who become sensual through evils of life and falsities of doctrine deprive ¹ themselves, by reasonings from fallacies, of the understanding of truth, but not others, except such as are sensual. They thus deprive themselves of spiritual life, because man has spiritual life through his understanding, for he becomes a spiritual man in the measure in which his understanding is opened and permits itself to be enlightened by means of truths. But it is by means of truths from good that the understanding is opened, not by means of truths without good; for man thinks truth so far as he lives in the good of love and charity. Truth indeed is the form of good, and all good with man is of his will, and all truth is of his understanding; therefore the good of the will presents its form in the understanding, and the form itself is thought from the understanding which is from the will.

Note a piè di pagina:

5414. 'And the sons of Israel came to buy in the midst of others who came' means the wish to acquire spiritual truths, like all other truths, through factual knowledge. This is clear from the meaning of 'the sons of Israel' as spiritual truths (for 'sons' are truths, see above in 5403, and 'Israel' is the celestial-spiritual man coming out of the natural, 4286, 4570, 4598, so that 'the sons of Israel' are spiritual truths within the natural); from the meaning of 'buying' as being acquired; and from the meaning of 'in the midst of others who came' as like all other truths, that is to say, ones acquired through factual knowledge.