From this Faustus argues that there can be no fulfillment of what is spoken of as so perfect that nothing can be added to it or taken from it. Faustus requires to be told that the law is fulfilled by living as it enjoins. The Lord has vouchsafed both to manifest and to impart this love, by sending the Holy Spirit to His believing people. The law, then, is fulfilled both by the observance of its precepts and by the accomplishment of its prophecies. 16 The law itself, by being fulfilled, becomes grace and truth.
Grace is the fulfillment of love, and truth is the accomplishment of the prophecies.
Christ's own words declare this.