If you have it and you know you have it, then you have it. If you have it and don't know you have it, you don't have it. If you don't have it but you think you have it, then you have it.
“They dined on mince, and slices of quince, Which they ate with a runcible spoon; And hand in hand, on the edge of the sand, They danced by the light of the moon.”
“Technical knowledge has now become an integral aspect of the Iranian psyche.”