Most of us have had ups and downs in our career, which Winston Churchill summed up in these great words: "Success is not final, failure is not fatal; it is courage to continue that counts."
Persistence might be the greatest strength, and -- as Churchill says -- it takes courage to move forward when we doubt ourselves. However, every success we have had was a time we could have failed. The only way to change is to take a change and move forward with courage. I'm not the biggest fan of Churchill. But, in this case, his words are great advice for anyone who is frustrated with their career or unhappy in their job. Find your "courage to continue."