We are spiritual beings made alive by the breath of God. This spiritual nature enables us to be in communion with our Creator and is more important than our physical nature. The value of a human being is not based on the work he accomplishes, but upon the inherent spiritual essence of bearing the image of God.
Work is necessary to provide for our own sustenance and to care for creation. All work is honourable and it is not beneath our dignity to get our hands dirty. Slavery could only exist where there were men and women who believed that certain types of work were beneath their dignity. Such an attitude dishonours our Creator. Selfish striving for honour and riches comes from the realm of darkness, as does the attitude that people who are mentally or physically unable to work as productively as we do are of lesser value than us.
Unselfish work for the good of others is a manifestation of the breath of God within us. Without that we are just dust and our thoughts and desires would be earthbound.
The only value we have is that God has breathed into us the breath of life, and for that reason alone, He wants us to be with Him for eternity.