Beliefs are what we use to model how the world is and what the results of actions and experiments will be. Reality is what actually determines those results, regardless of what we might believe. Truth is then the set of beliefs about the world that accurately model reality. And I'll say it again, the scientists who spend decades picking things to pieces are the ones who end up with the most accurate beliefs. They find the most truth.

>Truth is then the set of beliefs about the world that accurately model reality.

That's just one of the definitions of truth, and a quite naive one at that. Not just philosophy, even epistemology have not been using this for ages.

It's a correspondence definition. And actually I understand correspondence has been one of the most popular theories of truth since Plato and Aristotle, continuing to the present.

It's also known as Analysis, which is the opposite of Synthesis. Analytic thinking is central to science.