“There are two kinds of time. 

The one kind can be measured with instruments and calculations, just like streets or plots of ground.  But the other chronology, our memory, has nothing to do with metres and months, decades or acres.  What we have forgotten is old.  The unforgettable was yesterday.  The measure here is not the time but the value.  And the most precious of all things, whether happy or sad, is our childhood.  Do not forget the unforgettable.  I believe that this advice cannot be given early enough.”

- When I Was a Little Boy – Erich Kästner