The truth in us can never be purified of falsity without
virtual leavening, or so-called fermentation—that is,
without a fight put up by falsity against truth and by truth
against falsity. After the fight is finished and truth has
conquered, falsity drops away like the waste products of
fermentation, and truth stands purified, like wine, which
clarifies upon fermentation, the dregs settling to the bottom.
—Secrets of Heaven 7906:2