jaanus harro "miks me teeme asju, mida meile ei meeldi teha?"
...
harro viitab jaak panksepp'ale ja ütleb umbes nii: "tundeelamused on sõnadetagi olemas, aga neist rääkida ilma sõnadeta ei saa. sõnad panevad meid vahel teatud mõtteid mõtlema, mida me ehk nii kategooriatesse ei jagaks, kui me saaksime kuidagi teistmoodi."
...
milliseid piiravaid kategooriaid me kasutame?

Reports that say that something hasn't happened are always interesting to me, because as we know, there are known knowns; there are things we know we know. We also know there are known unknowns; that is to say we know there are some things we do not know. But there are also unknown unknowns - the ones we don't know we don't know. And if one looks throughout the history of our country and other free countries, it is the latter category that tend to be the difficult ones.
Donald H. Rumsfeld (1932 - ), Department of Defense news briefing, February 12, 2002