"I will delight in your statutes; I will not forget your word." (Psalm 119:16 ESV)
Why would one delight in the Law (rules, statutes, Commandments) of God? Delight in grace is easy to understand - but joy in the Law not so much. Here's C. S. Lewis' wise explanation:
"Their delight in the Law, is a delight in having touched firmness; like the pedestrians delight in feeling the hard road beneath his feet after a false short cut has long entangled him in muddy fields."I hope you stay out of the mud today.
- From C.S. Lewis, Reflections on the Psalms, page 55