When I was in my 20s I lived on a bicycle for a year, going around the lower 48 and Canada, and then up to Alaska. I lived for two weeks in Joshua Tree with a guy named Tom, who slept in a cave the whole time.

One morning we were sorting our gear and a piece of paper fell out of his wallet. As I handed it back to him, I read the three lines on it:

Work hard.

Be strong.

Don't complain.

I asked him about it, and he said that was advice his grandfather had given him. He wrote those lines down and carried them with him to remind him of what his grandather had told him. Those words have echoed in my mind for decades now. They're not absolutes; there are times to let go of work, to let yourself not have to be strong, and times to stand up and complain and protest loudly. But the spirit of that advice has certainly been a guiding force in my life.