Arcana Coelestia # 10301
10301. 'Pure' means devoid of evil. This is clear from the meaning of 'pure' as devoid of evil. Because all evil is impure, and all good is pure, the expression 'being purified' from sins and from iniquities is used. And it has regard to the heart, that is, the will; for the will is meant in the Word by 'the heart', 2930, 7542, 8910, 9300, 9495, since love is meant by it, 3883-3896, 9050.
Isaiah 29:8
8
It will be like when a hungry man dreams, and behold, he eats; but he awakes, and his hunger isn't satisfied; or like when a thirsty man dreams, and behold, he drinks; but he awakes, and behold, he is faint, and he is still thirsty. The multitude of all the nations that fight against Mount Zion will be like that.