Do your work for six years; but in the seventh, go into solitude or among strangers, so that the memory of your friends does not hinder you from being what you have become. ↗
Spend twenty years there and you ask yourself how there can still be strangers with so many familiar faces ... it's probably that cities generate strangers continuously ... ↗
It's also selfish because it makes you feel good when you help others. I've been helped by acts of kindness from strangers. That's why we're here, after all, to help others. ↗