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1.
To mortgage someone's mind is to transfer your very own mental masturbations to someone else, so that he is able to keep going with them even when you have already passed away. Pretty much as a mortgage that is passed over from father to son, this procedure allows for nonsense intellectual activities to keep going and alive for centuries.

Moreover, it is quite difficult to pay off the mortgage, as there is no lender usually, so you don't quite know who you are thinking for.
Medieval monks were able to keep debating over the sex of angels for a thousand years thanks to mental mortgage.
by Albert_Pla August 02, 2010