"For this is the love of God, that we keep his commandments. And his commandments are not burdensome." - 1 John 5:3

What are these commandments? Do they include the moral law in the Old Testament (Ten Commandments)? Or are they limited to "new covenant" laws?

The commandments we should keep are the totality of God's Law, in both the Old Testament and the New. Matthew 5:18 - "For truly, I say to you, until heaven and earth pass away, not an iota, not a dot, will pass from the Law until all is accomplished." Yes, Christ fulfilled the symbolic portions of the law and the prophets. But the principles of morality and justice found in the Law cannot be brushed aside because we live in the "age of grace." Was grace nonexistant before Christ? Surely not. Salvation has always been by grace through faith. But what is salvation if it is not the forgiveness of sin? And what is sin if the Law no longer applies?

The Law does apply today and should be kept, but Christians will continue to violate God's Law in this life. Thanks be to God that our lawless acts are forgiven by Christ! Only by His grace can we glorify Him by forsaking sin and growing in love. That's gospel-driven sanctification. That's the Christian life.