When we eat, our bodies break down the food and get from it both energy and materials for building and repairing the body. The process is similar on a symbolic level in the Bible. Food represents the desire for good and the insight that comes from that desire for good – goodness and understanding that come from the Lord. But to put them to use we have to take them in and make them our own – which is spiritual eating.

651. And shall overcome them and kill them, signifies the consequent destruction of every good and truth of the church. This is evident from the signification of "to overcome and kill the two witnesses," as being to destroy the things signified by "the two witnesses," which are the good of love and charity and the truth of doctrine and faith. That these will be destroyed by the affections of the natural man separated from the affections of the spiritual man, which are evil cupidities of every kind arising from infernal loves, is signified by "the beast that cometh up out of the abyss;" and that it was foretold that this would come to pass at the end of the church, when the Last Judgment takes place, has been said above. "To kill" signifies in the Word to kill spiritually, which means here to destroy the good of love and the truth of doctrine, as may be seen above n. 315.