One of the best pieces of advice I ever got from a manager was... "No one gives a fuck about your dreams." And even at that age — I was in my 30s, probably — it stung a little bit to hear. I was like, "how can no one care about my dreams? I care about them so much!"
But then, by that point, I had had enough... shall we say non-success — ten years of it, almost — where I was ready to hear that, and I was like, "All right, you know what? If no one else cares, then it's up to me to make it happen, and to care twice as much."