If you do not thank God often, you have a failing memory. Someone said it is like having spiritual Alzheimer’s, a disease that causes memory loss. It can become so severe that suffers forget their children and their spouses. How can you thank someone you don’t remember knowing? All you can say is, “who are you again?”
Believers With Poor Spiritual Memory behave that way to God. We may not quite be like Pharaoh who asked “who is God?” but we are quite close to him. Particularly when we complain and wonder what God has done for us lately. No doubt, you know some such believers who ask, “what has God done for me that I should thank Him?”