In this [related question](https://judaism.stackexchange.com/questions/40965/what-is-the-point-of-davening-praying), it is discussed why we daven in the first place. The question still remains: I could very well ask for what I want, even if it's detrimental to me. For that matter, I could even [daven that I be successful in an aveirah](https://judaism.stackexchange.com/questions/72949/should-a-robber-pray-to-be-successful-in-robbing-a-bank?rq=1). Why should we daven for such things? Why don't we just go along with our day, trying to follow the Torah as best as we can, and trust that Hashem will do what is best for us? From that perspective, wouldn't asking Him for something be a failure in this self-test of emunah?