… At the same time you are slave, and free; slave, because you are created such; free, because you are loved by God, by whom you were created:  yes, free indeed, because you love Him by whom you were made.  Do not serve with discontent; for your murmurs do not tend to release you from serving, but to make you a wicked servant.  you are a slave of the Lord, you are a freedman of the Lord:  do not seek to be emancipated as to depart from the house of Him who frees you … (Commentary on Psalm 100)