VaYikra 27:10

Verse 10. Nor is it allowable for such a person to pass from a prevailing state of good or truth, to a prevailing state of evil or falsity; nor can he who worships from an interior ruling affection, descend to one that is exterior; nor from an exterior ruling affection can he ascend to an interior; but if he fluctuates between good and evil in the course of temptation against his own will, then by victory good is confirmed and evil is rejected, both states of confirmation and rejection being holy.