Here is why.

While I know that there are circumstances that can make it hard to impossible to get another job, I also know what it is like to feel trapped in a job you hate. Frequently people in that position (particularly capable ones) are not actually trapped, it just feels that way.

The times that I make that comment (and I don't think I do it very often) tend to follow a specific pattern. The pattern is one where you have to live with and fight bad technical directions from above without having input. Why do I make it then? Because in my experience and in the experience of friends that is very stressful. In fact so much so that Scott Adams makes a fortune lampooning it in Dilbert.

Now is that advice right for everyone? No. So I say what I would do, leave it up to you to make your choices. My situation is not everyone else's. I am married, I have some obligations. OTOH I also have good credit, a small cushion and I believe myself to be very employable. YMMV. It also depends what you want out of life.

But that advice really is right for a lot of people who feel scared to change. I know that because I have friends who have passed that breaking point and done something about it, with very good results. So if you are really unhappy with your job, are capable, and specific things are being pointed out that ring true to you, that is a sign. Stop and think about whether looking for another job might be a good idea.

But for Pete's sake. Just because another monk says, "I would quit!" does not mean that you should!!! (And does not mean that that monk would in your position either.)