What does Genesis 39:5 mean?
Once Potiphar put Joseph in charge of his house, God poured out enormous blessing on the household and the fields. The implication is that God increased Potiphar's wealth and wellbeing in every area where Joseph was responsible. Potiphar benefited in extraordinary ways, apparently, because God blessed Joseph. It was clear and evident to Potiphar that his life was better because of Joseph's God (Genesis 39:1–4).This indicates that Joseph understood that he was blessed by God, and he told Potiphar it was God who was responsible for the blessing. Joseph may have seemed arrogant when explaining his dreams to his brothers (Genesis 37:5–11). Here, however, he was clearly humble enough before Potiphar to credit the Lord with all his success.
In the same way, our lives can bring greater glory to our God when we openly give Him credit for good things that happen to us and through us.