Samuel Rutherford (Trial and Triumph of Faith, 311):
God delights to have men and angels his debtors. Grace holdeth an open and a free inn, with all the dainties that Christ can make, to all comers and goers, for nothing but thanks, and heartily welcome. Grace maketh no gain of my work. The sweating of angels, and of the thousand thousands that sing up the glory of Christ before the high throne, is no income to Christ's rent. Grace would not be grace, if it could traffic, or buy, or sell with a creature. Angels and men stand in the books of free grace for millions of borrowed sums. Christ's blood and deep love may be praised, but never recompensed. Christ's love hath filled this world and the new paradise with debtors; and angels can neither read, nor sum, nor cast up the accounts of free grace.
