The Third Wave by Alvin Toffler, the sequel to Future Shock. I was a nuclear trained engineer in the Navy. This book convinced me not to pursue a career in nuclear power after the Navy, which was the standard career path for guys like me, because it was "Second Wave." The Third Wave was information technology, which I pursued despite having no training in it.
At the height of my success, "The Arrangement" by Joni Mitchell made me realize that money hadn't made me happy and pursuing more was not something I wanted to do.
You could have been more
Than a name on the door
On the thirty-third floor in the air
More than a credit card
Swimming pool in the backyard
While you still have the time
You could get away and find
A better life, you know the grind is so ungrateful
Racing cars, whiskey bars
No one cares who you really are