This proposition assumes some knowledge about terminology, especially the term exist. Would probably be good to untangle that. Etienne Gilson does an excellent job in Being and Some Philosophers untangling the nuances of concepts such as being, existence, and essence.
Philosophers expend even more energy trying to define words then freepers do on threads debating evolution (several accepted distinctly different definitions...ill-defined) and creation. Thanks the book reference, the content and reviews on amazon look interesting.