I’ve heard that the more trust you have in Hashem, the more Hashem does for you. For example if you have a high level of Emunah in Hashem that your kids will be handsome, your kids wills come out handsome. I’m curious where the speaker got this from. Cite sources please?
The Rambam in Moreh Nevuchim 3/51 s.v. והנה נגלה אלי, and the Maharal in Nesivos Olam in Nesiv HaBitachon in the first paragraph, are two of the many sources for this.
However, the Chazon Ish in Emunah u'Bitachon seems to question the obligation to think this way, since this good thing your trusting will happen was not heard from a Navi.