The young men know the rules. The old men know the exceptions. When there is a hill to climb, waiting won't make it smaller. Don't ask a barber if you need a haircut. If you ever invent a time machine and are traveling back in time, and you see somebody else traveling forward in time, it's best not to make eye contact.
Life is merely energy condensed.
Energy is a form of matter. Matter cannot be created or destroyed, only converted and transfered. If a clock ran counterclosewise, technically, by definition, it would still be running clockwise. Likewise, no matter how hot or cold a room is, it is still room temperature. The paths of glory lead but to the grave.