Beliefs are surely mental states, i.e., the result of making up our minds about how things are. But what about desires? Should we not rather call them "cordial," i.e., of the heart, not the mind, and do they not feel rather more like "drives" than states?
Mallarmé tried do his thinking with his heart. Frege no doubt thought his feelings were mental. Poets and philosophers, both, want it all, but reduced to a single organ of their professional preference. Is it not rather this: that we think with our minds and feel with our hearts?
We are as passionate as we are rational. Our beliefs and desires do not meet in our minds. Rather, our desires drive us into cordial relations with one another, while our beliefs fix our mental position among things.