Depends.

What is “comfort”? Does “discomfort” motivate you to work harder, or is it the work, itself, that feels like slogging through sludge? Do you need the compensation? (If you need the <$1/day I’m earning on Medium, then go get a job slinging burgers — it makes the pay at Mickey D’s look princely.) Or do you do the work because you love it? (If you do it because you love it, and you’re “not feelin’ it, today” then forcing it can just lead to burn-out and make you hate the thing you love, because it’s not providing you with the rewards you seek OR the compensation you need to support the people and other activities you do love.)