GC, p. 263

There is, therefore, the closest connection that can be conceived, between the law and the gospel. On the one hand, the law continually makes way for, and points us to, the gospel; on the other, the gospel continually leads us to a more exact fulfilling of the law. The law, for instance, requires us to love God, to love our neighbor, to be meek, humble, or holy. We feel that we are not sufficient for these things; yea, that ‘with man this is impossible;’ but we see a promise of God to give us that love, and to make us humble, meek, and holy: we lay hold of this gospel, of these glad tidings; it is done unto us according to our faith; and ‘the righteousness of the law is fulfilled in us,’ through faith which is in Christ Jesus...