The more grace we receive from God, the deeper our longing for grace is.
The more a true saint loves God with a gracious love, the more he desires to love Him, and the more uneasy is he at his want of love to Him; the more he hates sin, the more he desires to hate it, and laments that he has so much remaining love to it; the more he mourns for sin, the more he longs to mourn for sin; the more his heart is broke, the more he desires it should be broke: the more he thirsts and longs after God and holiness, the more he longs to long, and breathe out his very soul in longings after God. The kindling and raising of gracious affections is like kindling a flame; the higher it is raised, the more ardent it is; and the more it burns, the more vehemently does it tend and seek to burn. So that the spiritual appetite after holiness and an increase of holy affections, is much more lively and keen in those that are eminent in holiness, than in others; and more when grace and holy affections are in their most lively exercise than at other times.
Jonathan Edwards, The Religious Affections.