The Importance of Balance in Life

I think almost all of us are neither purely altruistic nor purely selfish, right? It's like we truly are a combination. And so to me, I'm always trying to balance those three things and not let any of those three categories overwhelm the others. How do you think about what the right balance is? Is it mainly an intuitive thing? Or if there's a deficiency in one, that's where you put your attention in or is that like juggling?