What God has blessed no man can curse.
Satan was envious of Job's wealth and happiness.
Our father- Don Moen
The blessings of God are a fence around you.
Satan attacked God's work in Job in three ways. Through Job's body, because he never got sick. Secondly, by his family, since Job had been blessed with a big happy family. Finally, for what God had given him. He was immensely rich and so the devil was sure that if the three blessings were to be taken from him, then he would surely curse God.
No matter how the devil was to injure you, try in your mind to be sure that when you have the blessings of God, then you have a fence around you. In Numbers 23 Balak tried to curse Israel using Balaam, but the prophet could only pronounce a blessing to Israel.