How then could I do such a wicked thing and sin against God? Genesis 39:9
The fear of God is healthy. Joseph understood this. Though he was in an environment where he could sin and nobody would know, he knew that most importantly God would know. This is healthy, because a respectful attitude toward God is accountability. No matter where we are or what we are doing, we know God is watching, and we know that He expects us to represent Him well. Wherever there is God, there is accountability.