If someone lacks mental strength, they can’t keep anyone in their thoughts due to exhaustion. You can obtain mental strength by emptying your mind. - Joseph’s “just my thoughts”
Certificates are often more valuable in proving "there is none" than in proving "there is one." For example, a birth certificate is more beneficial in proving the only person in the world by proving an unborn existence like him or her than in proving the person's existence. That is, proof of absence is more valuable than proof of existence. We don't know where value comes from. What is the real element of our existence and our occupation? - Joseph's "just my thoughts"