Does your calling make you miserable?

Here’s a quotation from the book, The Education of a Coach by David Halberstam:

It was not a profession that offered a lot in the way of tranquillity. “My wife has a question she asked me every year for ten years,” Bill Parcells said back in 1993 when he was still married, “and she always worded it the same way: ‘Explain to me why you must continue to do this. Because the times when you are happy are so few.’ She has no concept.”

Halberstam, David (2012-07-17). The Education of a Coach (Kindle Locations 3736-3739). Hyperion. Kindle Edition.

It’s clear for some football coaches like Bill Parcells and Bill Belichick, coaching is their calling. Does that mean you have to be happy all the time?