Is there a word that means "a way of thought"?
For example, whether someone is interested or not, it is simply how he thinks. Whether someone is confident or not, it is simply how he thinks. So "interest" and "confidence" are simply "ways of thinking".
I was thinking of the word "mental", however "mental" means "relating to the mind" which is too broad. For example, "tiredness" would be "relating to the mind", but it isn't a "way of thought".
What's another word to mean "a way of thought"?