When considering God's law, one must consider two things: not to fall into moralism, but at the same time not fall into antinomianism.
Moralism is making a series of rules that must be followed in order to be righteous or save oneself.
Antinomianism is ignoring following any command at all. What does it matter? A Christian is saved by grace. Sin boldly. God is forgiving.
Yes, God is forgiving and loving and gives us the grace of salvation.
Yet, we are journeying on a thin blade. To the left is tying rules around necks and lists of "do nots," and be sure to do this every day or else. To the right is the temptation to ignore God's commands and spiritual disciplines altogether.
But right in the middle is where the Lord wishes us to receive his grace. The Christian knows what he must do and what not to do (the ten commandments where it begins). If he doesn't know, read the Scriptures and trusted commentaries and church fathers. We must also be doers of the Word, not just knowers.
To follow the Lord is out of love and is made to be a joy. Christ is the one who brings us to life in His law, which is his discipline, which is His love. Because he wants to make us something much better than we could ever strive to do ourselves. His law of love hurts us because we are stubborn and want to remain where we are comfortable. But this formative faith, which we call Christianity transforms. Taking away the dross of bitterness, unbelief, immorality, hatefulness--name all the sins. We may think we are on the path of righteousness by following our to-do lists, but it is Christ who transforms, not us.
As a Christian, one must put the self in the path toward Christ. This is where prayer, meditation on the Word, fasting, and studying the Scriptures are a beginning point, changing the "inner man." Doing these things transform us because the Holy Spirit is directing us. He transforms, not us.
When one works on the "inner man," then the outward disciplines begins to surface: solitude (spending time in the Lord's presence silently), simplicity, submitting to those wiser than you, and serving others. Which then moves into the corporate disciplines: confession, worship, guidance, and celebration.
The Spirit of God is the one that gives life through the spiritual disciplines. They are like the soil the seed is planted in. God comes along and makes it grow.