This article aims to demonstrate that a special category of desire – a state which is sought unconditionally, as an end (sought in and of itself) – is the only ultimate value that logical observers can conceive upon consideration of sufficient conceptual depth. This demonstration appeals to logical reasoning, and ultimately, the reader’s inability to conceive alternate conclusions which are logically consistent. Key words: A Priori, Beings, Desire, Objectivity, Ultimate value, Logicality, Morality, Moral-rationalism, Purism, Moral-realism, Realism.