putting this here, HELLO CCCC FANS!! i hate hate hate when people mischaracterize Mind as emotionless like noo :(( he can feel emotions like worry, excitement, confusion and sympathy and all that. sure Mind is blunt and mean but that is his nature and I'm sure he is not grumpy almost all the time. (he can get excited for something for god's sake >:(
Mind is more verbal about his own thoughts than Heart's so that's why he's more judgemental (or seen as) but Heart's nature is also as vile as Mind's, there is no good or bad in this story (see them as not so black and white)
one more thingy, i think Mind often hides his feelings from Heart and Soul because he feels embarrassed to express them. so he's also a victim of his thoughts, they're inevitable