Ecclesiastes 2:17. Sin leads to the disintegration to every area of life, especially work. Dependence on Jesus, and not just abstract belief, is the only way to an unshakeable, purposeful life of work.
1 Corinthians 7:17 Only let each person lead the life that the Lord has assigned to him, and to which God has called him. This is my rule in all the churches. God shows us that all work is dignified work, no matter status, education, or financial gain.