The best measure of a man's honesty isn't his income tax return. It's the zero adjust on his bathroom scale.
There are lots and lots of challenges that I wished - at the time - that I had done. There are lots of occasions where there were exciting things to be done but for some reason or another it was physically impossible for us to do them. I still wouldn't mind if I was able to go down into this most impressive valley in the Antarctic, but of course those things are beyond me now.