My late mother was not a particularly philosophical woman, but she did occasionally pass on bits of advice that have always stood me in good stead.
"Always look after the underdog"
"If you can't be easy, be as easy as you can"
"Everything happens for the better"
"When making friends, look for those who show enthusiasm"
There were many others snippets, but the one that comes to mind most often is the final one. I can't say that I've ever actively gone out looking for enthusiastic people, but they have naturally come my way. Maybe their mothers told them something similar, and they have sought me out. Who knows!
There are few other traits that are more attractive and appealing than enthusiasm. Show me someone who shows no enthusiasm for anything at all, and I'll show you someone that I avoid like the plague!