The question, “What is intelligence?” is deceptively simple. However, scholars have engaged in series of research in order to answer it. Till date there is no simple answer accepted by experts in the relevant disciplines. Attempt to identify a standard definition has been very challenging. This failure is connected with the fact that defining intelligence requires the application of problematic and abstract concepts. Consequently, some researchers decided to put forward theories as an attempt to capture the nature of intelligence. However, (...) this option, as reflected in this paper, further deepens the problem it purports to resolve. The paper is an inquest into the intellectual travails of scholars who fruitlessly attempted to grasp the nature of intelligence. The paper avers that these travails are caused by scholar’s reliance on ontological proof of intelligence which stipulates the possession of brain and mind as evidence of intelligence. The epistemological proof which relies on overt behaviour as index of interpreting intelligence is projected by the paper as a plausible means of overcoming the nebulous nature of the concept. -/- . (shrink)