This is very dangerous advice to give a young person. But the author should have done a better job at interpreting the message. If your father tells you that you can do whatever you want, do you conclude that you can get good enough at tennis to win the US Open? No, of course not, that's absurd. But winning the US Open is MUCH EASIER than discovering the Holy Grail of physics. Properly understood in this context, the father's message meant "if you want, you can become a physicist" - and it was probably correct. The author's downfall was that he overinterpreted the promise of the message and was also too ambitious to accept the lesser reward of "merely" becoming an average professional physicist.
This is very dangerous advice to give a young person. But the author should have done a better job at interpreting the message. If your father tells you that you can do whatever you want, do you conclude that you can get good enough at tennis to win the US Open? No, of course not, that's absurd. But winning the US Open is MUCH EASIER than discovering the Holy Grail of physics. Properly understood in this context, the father's message meant "if you want, you can become a physicist" - and it was probably correct. The author's downfall was that he overinterpreted the promise of the message and was also too ambitious to accept the lesser reward of "merely" becoming an average professional physicist.