This is a re-post from the excellent Gospel Coalition blog by Ray Ortlund. Great nuggets like these make his web site one of my favorite reads.
“God’s grace to His people is continuous and is never exhausted. Grace knows no interruption and no limit. In contrast with the Law it stresses the dynamic character of the Christian life. Law can be mastered. A man may acquire merit by conforming to it. He knows the precise requirements that are demanded of him. But grace is always an adventure. No man can say where grace will lead him.”
Leon Morris, The Gospel according to John (Grand Rapids, 1971), page 111.