It's definitely a trite aphorism, but presumably it's talking about endurance in the face of adversity, not physical strength. I've thought of that aphorism fr

It's definitely a trite aphorism, but presumably it's talking about endurance in the face of adversity, not physical strength. I've thought of that aphorism from time to time when I encounter people on vacation here in Mexico, let's say, who seem to become a wreck when some small thing doesn't go as they'd liked. Like the kitchen is outside next to the pool, so there's no A/C and how dreadful is that. And the boy at the cenote charged them 60 pesos ($3) while a sign says that resident Mexicans only pay 30 pesos and that's unfair for someone who has 10x the wage of the resident Mexicans. And someone had a chicken on the bus going to Guadalajara. And now they're going to grumble with their spouse for six hours over it. And there was an iguana in their shower this morning so now they're getting management involved. I'm thinking this is a weak, pathetic man crippled by a life too comfortable.