Existence

The very concept of a “nonexistent object” has an air of paradox about it, at least for those philosophers whose thinking is rooted in the Humean tradition. For Hume suggested that to think of an object is always and necessarily to think of an existent object, or to put it differently, that to think of an object and to think of the same object as existing are just one and the same thing.--- Stanford Encyclopedia of Philosophy, "2006""First published Tue Aug 22, 2006; substantive revision Tue Mar 19, 2019"