Oswald doesn't take the weekends off.
The disposition of sin is not immorality and wrong-doing, but the disposition of self-realization – I am my own god. This disposition may work out in decorous morality or in indecorous immorality, but it has the one basis, my claim to my right to myself. When Our Lord faced men with all the forces of evil in them, and men who were clean living and moral and up right, He did not pay any attention to the moral degradation of the one or to the moral attainment of the other; He looked at something we do not see, viz., the disposition.
Whether highly decorated moral achievement or highly undecorated immoral disaster, we sin in our disposition toward God and our need to receive His revealed righteousness in Jesus Christ.
The essence of sin is, "I know what's best for me."
Not only this, but expecting God to reward or overlook the things you reward or overlook in yourself.
The ultimate middle finger we give to God is not only that we choose and prefer our ways to His ways, but that we fully anticipate Him to agree with us at the end of the day.
We expect Him to curb His preferences in order to cater to ours.
We flip Him offf and tell Him that He can't be mad at us because He should be above that.
We do all of this because we believe we make better gods than He does.