Separation to God, separation from the world, is the first principle of Christian living.
Spiritual advancement is measured by faithful obedience.
A Christian life is an unending engagement on the battlefield.
Actually, only God can satisfy a Christian's heart; man cannot.
So we can say, reverently, that God never gave us the Law to keep: he gave us the Law to break! He well knew that we could not keep it.
Without this heart attitude it is exceedingly difficult for us to accept the circumcision of the flesh. Every affection, desire, thought, knowledge, intent, worship, and work of the flesh must go to the cross.