"Have You not made a hedge around him, around his household, and around all that he has on every side? You have blessed the work of his hands, and his possessions have increased in the land. But now, stretch out Your hand and touch all that he has, and he will surely curse You to Your face!"
God had a special protection over Job. "You have made a hedge around him, protected him, his household, and all that he has on every side." God was taking care of Job, He'll take care of those who put their trust in Him and leave their worries and problems with Him. Satan can't get past God's hedges, so, Job truly had no reason to fear anything not in God's will. God blessed Job; he had what he needed, plus.
Satan wants to destroy the (seemingly) fragile connection between God and man. He doesn't seem to realize that God is in control and will only test those ready for or in need of testing.
Lord, if ever I have a test such as Job hand, I pray that I will have enough strength not to curse You, but to stand up for You. No man has seen God's face, so there is no way Job could curse You to Your face. There however is also no way he could curse You without You knowing, for God, You know all. But more than just knowing all, You have all wisdom! Thank You God for Your wise direction in all things.