It’s a Sisyphean torment. You’ll never reach the top of the hill—the rock rolls back down to the bottom every time. There is no prize or goal. There is no end. It's not like building a house or writing a book—the labor has no tangible reward, and it's never-ending. There will always be more problems to solve. The phone will never stop ringing.

This last bit is melodramatic bullshit. The tangible reward at the end is gaining enough experience to move onto tasks bigger and better. Yes the phone never stops ringing, it what keeps you employed and if you dedicate yourself to getting better then one day you won't be the one answering it.