"The debate within Intelligence studies over its central conceptual term is by no means a discipline-specific problem. International security experts have debated the term “terrorism” ad nauseam, while biologistshave been at war over the term “species” for over two centuries. In contrast to these parallel debates over the respective essences of “terrorism” or “species”, scholars of intelligence add that intelligence is under-theorized. In short, they posit the following: if we think harder we could get a better, more functional, definition of intelligence."
January 1, 1970
https://en.wikiquote.org/wiki/Intelligence_(information)