It is not difficult to make microbes resistant to penicillin in the laboratory by exposing them to concentrations not sufficient to kill them, and the same thing has occasionally happened in the body. The time may come when penicillin can be bought by anyone in the shops. Then there is the danger that the ignorant man may easily underdose himself and by exposing his microbes to non-lethal quantities of the drug make them resistant.
I don't enjoy the diminishing agility of the body!I had knee surgery and I no longer can go do three yoga classes and run. It's not as much fun, physically. But emotionally, it's way more fun. I am so much happier and contented and less agitated - I'm just calmer. So it's like everything in this human existence, it's a trade off - it's like you trade the virility of the body for the agility of the spirit. That's a good line. I have to remember that!