"What you believe dictates your actions, and actions lead to the desired outcome." Many people who are frustrated or unhappy with their current outcome in life think the best thing to do is make a different choice.
Something different because the current situation is not what we thought it would be. Now sure there are times when making a switch can be a very good thing, (especially when it doesn't go against God's guidelines) but many times after the "newness" has lost it's sparkle, we start looking again for something different.
Possibly because it's easy to address actions or choices. Example, if I asked you "how" you spend your money, you could easily show me your debit card statement or check book or even credit card bill. The "outcome" of those items reflect what choices you made. But if I was to ask you, "what do you believe about money?" That may take some work in articulating properly. That's why it's especially important to address our "beliefs" and what we truly believe.
When it comes to changing your outcome, it's been well said; "wherever you go, there you are." The one factor that remains the same in every situation is "us."
Philippians 4:13 is the famous verse where Paul says, "I can do all things through Christ who gives me strength." And when you look at it in the verses leading up to it you find that it's the strength in Christ that gives contentment in every situation.