To my way of thinking these are very different things. — EricH

Another difference, which gets close to the issues that concern Rödl, is that "1) The oak tree is standing there" is asserted from an implied or absent point of view, whereas "2) I think that the oak tree is standing there" is as much about what I think as it is about the oak tree; it is incorrigibly 1st-person. This can be readily seen by constructing denials of the two statements.