You have to continually remind yourself that you are only temporarily existing on this planet. You will not live forever. While it's fine to save money for the future or to hand down to other family members you can't take a thing with you with you die. Even Howard Hughes with all his vast billions died alone and doesn't have a penny to his name now. He worked so hard, stepped on other people and climbed his way to billionaire status.
Life is meant to be enjoyed.
It gets boring going through life looking over your shoulder all the time. Mankind always wants more than they presently have. No, you then want another million. Only God can help you recognize greed when it starts and help you to defuse it.