1877 · Charles Haddon Spurgeon, Spurgeon's Sermons, Volume 23 (1877) 1347
Now, dear Friends, the Lord might have willed to make the condition of salvation a mitigated form of works. If He had done so, it would not have been of Grace, for it is a principle which I need not explain now, but a fixed principle, that if the blessing is of Grace it is no more of works, otherwise Grace is no more Grace. And if it is of works, it is no more of Grace, otherwise work is no more work. As water and oil will not mix, and as fire and water will not lie down side by side in quiet, so neither will the principle of merit and the principle of free favor. You cannot make a legal work to be a condition of a gracious blessing without at once introducing an alien element and really bringing the soul under the Covenant of Works and so spoiling the whole plan of mercy! Grace and faith are congruous and will draw together in the same chariot, but Grace and merit are contrary, the one to the other, and pull opposite ways and, therefore, God has not chosen to yoke them together. He will not build with incongruous materials or daub with untempered mortar. He will not make an image partly of gold and partly of clay, nor weave a linsey-woolsey garment—His work is all of one piece and that one piece is all Grace!