Walt Disney had a very clear sense of why. He was about happiness. Remember when Disney was founded, it was during war. People said that life sucked. And he said, "No." He was an eternal optimist who said: "Life is beautiful. It's about giving. It's about family." Look what happened. His cause grew and people committed themselves to helping him grow the Disney why and it was hugely successful.
Simon SinekWe invest in things like the future, like our children, like education. In other words, we invest in things that we understand we will not see an immediate return of investment but everybody knows it will have a positive impact and you can easily measure it over the course of time. Your why is exactly the same thing.
Simon Sinek