God is calling us to be proactive with our faith so we can grow and be mature. This requires us to be faithful which requires us to submit and to be humble. The result is respect, cooperation, unity, community, and the power of His Fruit at work.
Most Christians ignorantly will state that the law has nothing to do with then since they are under grace. But, according to the Bible, this is not the case!
God does not reject us; rather, it is us who reject Him, He goes out of His way to give us the grace we do not deserve. He gives us His Way, even though we continue to fight against Him by hardening our hearts and rejecting His Truth and precepts.
The key we need to understand is this, sin entered in the world by one man that affected all people by Adam; but the grace of God, which justified us, comes in the world by one man/God. All of humanity deserved it, Christ did not; thus, yes it is unfair- to God, but not to us!
Being a true disciple means having a willingness to trust Him completely in all aspects of life from the highest highs to the lowest lows. It means we are not only willing to trust Him to provide for our salvation, but also for the future.