The owner of a field should plow it clear it of thorns sow it and water it if water is available and at the same time rely on the Creator may He be exalted to make it fertile protect it from disasters increase its yield and bless it. He should not leave the earth untitled and unsown relying on the Creators' predetermination that it will bear fruit without him first sowing seed. In the same way, artisans, merchants, and laborers must pursue their livelihood in their respective callings while trusting in GD that sustenance is in His power and under His control, that He guarantees it to a man and provides it to him by whatever means He pleases One should not think that the intermediate cause can help or harm him at all. pg 405