ものと思う

ものと思う is a formal, somewhat literary way to express the speaker’s belief, expectation, or assumption about a situation as if it is natural or definite. It often conveys the speaker’s confidence that a result will occur, or that a certain state is true, based on their judgment or widely accepted reasoning. It can sound a bit old-fashioned or formal, so you’ll see it in writing, speeches, or careful narration rather than casual conversation. The nuance is stronger than simple と思う, because it frames the belief as something held to be almost self-evident or reasonably presumed in the given context.