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If you know yourself, know that you're not wired to be a particularly ambitious person then this advice is useless.
On the other hand, if you are an ambitious person or a workaholic, then this is probably quite useful advice!
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From Sun Tsu - The Art Of War:
If you don't know yourself and don't know your enemy, you will always lose.
If you only know yourself or your enemy, you will win half the time.
If you know yourself and know your enemy, you will always win.
Completing goal isn't the objective. The objective is to get as far down the path as you can. It doesn't matter if you don't complete it. What matters is that you got as far as you can.
If you're not enjoying the process then it feels like treadmill that you want to get off. If you are enjoying it then it feels like an exhilarating, wild ride...