I am not saying you should not work hard and aim for achievements, heck, even help the world get a little better (in some cases).
But don’t kid yourself. Sure, culture and mission is needed in a company. But they are not for your benefit. Be the lemming, if that suits you. If you own or have a finacial stake in the company sure, grind-to-win applies to you. For everyone else sorry, but you are a special kind of retarded to trade your actual life (you only have one, remember) for the benefit of others who couldn’t care less about you.
It’s actually possible to do great work at 40 hrs or less per week. If you need more, you’re not doing it right.