The loins, as in Ezekiel 29:7, signify the marriage of truth and good. In general, loins signify love, and when referring to the Lord, divine love. They can also signify the interiors of conjugial love. In Isaiah 11:5, they signify people in the divine good of love, and reins signify people in love towards their neighbor.

(Odkazy: Apocalypse Revealed 830)

6682. 'And he said to them, Why do you act like that and keep the boys alive?' means anger that the truths were not destroyed. This is clear from the meaning of 'why do you act like that?' as words of reproach, and so of anger; from the meaning of 'keeping alive' as not destroying, as above in 6677, 6680; and from the meaning of 'the boys' as truths that are the truths of good, dealt with in 6680.