Thomas à Kempis:

Gifts of nature are common to good and bad, but grace or love is the peculiar gift of Thine elect, and they that bear this mark are accounted worthy of eternal life. This grace is so excellent, that neither the gift of prophecy, nor the working of miracles, nor the understanding of deep mysteries, is of any worth without it. But neither faith, nor hope, nor any other virtue is acceptable to Thee without charity and grace.

Poetics of Prayer @Izak