“No man ever steps in the same river twice, for it is not the same river and he is not the same man.” David Deutsch

(…) “We do understand why the world doesn’t run in reverse. There is a reason, we have a scientific explanation, and it´s called the arrow of time. We are compelled to travel into the future. And that´s because the arrow of time dictates that as each moment passes, things change. And once these changes have happened, they are never undone. 

Permanent change is fundamental part of what it means to be human. You know, we all age as the years pass by. People are born, they live and they die. I suppose it´s part of the joy and tragedy of our lives. But out there in the universe, those grand and epic cycles appear eternal and unchanging, but that´s an illusion. See, in the life of the universe, just as in our lives, everything is irreversibly changing." Professor Brian Cox

“Be the change you want to see in this world.” Mahatma Gandhi