 Philosophers connect sentences with various different items, such as thoughts, facts and states of affairs. Thoughts are either true or false in an absolute sense, never both or neither. A sentence such as “Socrates is wise” is true (false) in virtue of expressing the true (false) thought that Socrates is wise. Thoughts are also the contents of propositional attitudes like belief and desire. For example, John’s belief that Vulcan is a planet is a relation between him and the thought that Vulcan is a planet. Since there is no such planet, the thought that Vulcan is a planet cannot be composed of Vulcan and the property of being a planet. It is composed, among other things, of a way of thinking that purports to latch on to a planet. This so-called mode of presentation may be expressed by a definite description like “the planet between the Sun and Mercury”.