Is changing jobs often a good idea?

I really didn't like the idea of changing jobs at first. I thought that they were leading an unstable life. However, it's not always true. I think like this when I first changed my job.

Now I meet new people which really provide me good thoughts. They amaze me when I work with them. It was completely different from those I work before. I think it's a great change.

I also gain another experience. No, many experiences from my new boss, my new co-workers. They have been teaching me lots of thing which I can apply to my next career, I think.

Now I'm like a frog which got off an old well to to new pond, new river, or new lake. Can I say a new ocean? Do frogs live in the ocean? I think not.

When I said this, I didn't mean forgetting all about my old career. I still love teaching. It has always been the first priority to me. I still like talking to my school colleagues about teaching, listening to their difficulty and joy about teaching. One day, I hope that I will involve completely in education field.