" The greatest hazard for the old is laziness. It makes the body grind to a halt. And then you might as well forget about starting over. I rarely regret the things I reluctantly make myself do. Even after struggling against wind and rain, I can tell myself smugly when I get home: I'm glad I did it. That's crucial: reminding yourself beforehand how you'll feel about it afterwards. "

― Hendrik Groen , Zolang er leven is - Het tweede geheime dagboek van Hendrik Groen, 85 jaar