Forgetfulness is necessary to remembrance. Ideas are retained by renovation of that impression which time is always wearing away,and which new images are striving to obliterate. If useless thoughts could be expelled from the mind, all the valuable parts of our knowledge would more frequently recur, and every recurrence would reinstate them in their former place.
Samuel JohnsonYou teach your daughters the diameters of the planets and wonder when you are done that they do not delight in your company.
Samuel Johnson