Excerpt, The Letters of John Newton (John Newton)
But a Christian is to pursue his lawful calling with an eye to the providence of God, and with submission to his wisdom. Thus, so far as he acts in the exercise of faith, he cannot be disappointed. He casts his care upon his Heavenly Father, who has promised to take care of him. What God gives, he receives with thankfulness, and is careful as a faithful steward to improve it for the furtherance of the cause of God, and the good of mankind. And if he meets with losses and crosses, he is not disconcerted, knowing that all his concerns are under a Divine direction; that the Lord whom he serves, chooses for him better than he could choose for himself; and that his best treasure is safe, out of the reach of the various changes to which all things in the present state are liable.