Everything you want is on the other side of comfort (fear, pain, fatigue). It's biological/ psychological and it's known as hedonic adaptation.

I figured that if I want to live contently, I should live honestly and courageously.

Honestly in a way that I respect my inner wishes. [Only I know what they are!]

And courageously in a way that I act in line with them.

If I do that, I live contently.

The thing is, moments at 100% contentment are moments at 0% comfort. Living life at 100% discomfort leads to the most fulfilling life.

But, I am just a man. Sometimes I just need to get through the day, experience life at 100% comfort.

[Extra: I call Mark Twain's quote "Find a job you enjoy doing, and you will never have to work a day in your life" a bluff.

First, hedonic adaptation will sooner or later make you want improvements to your lifestyle.

Second, even if there was no hedonic adaptation at play, experiencing joy as short-term component of luck, will inevitably lead to lack of contentment (a long-term component of happiness).

It won't make you happy if that's what you're striving for. Though I should note that nothing will make you happy, if that's what you're striving for. Happiness is a state of mind that occurs precisely when you're not striving for it - when you're not even thinking about it. The moment you ask yourself whether you're happy is already a sign that you aren't.]