. "Of the mind, incomprehensible , inconceivable : cum igitur illa incerta (natura) incomprehensibilisque sit, incomprehensible , Cels. praef. med. ." . "Of the mind, incomprehensible , inconceivable : cum igitur illa incerta (natura) incomprehensibilisque sit, incomprehensible , Cels. praef. med. ." . .