Communications are still very imperfect, but have been greatly improved of late years.
Even an exceptional salesperson has an imperfect memory.
The one is the Confession, which is contained in an imperfect state in the Book of Armagh (c. 807), but complete copies are found in later MSS.
But there are gaps in Kant's system - a imperfect gap between sensation and the sense-forms of time and space; a gap between sense-forms and thought; a gap between the lower but practicable processes of the Understanding and the higher but unrealizable ideas of Reason.
But the knowledge was very imperfect; neither was it much clarified by H.