There are three glasses.
There is, first, the glass that is half-empty, in it the sour milk of days gone bad. Second, there is the glass that is half-full, of iced lemonade on a summer afternoon, or of hot chocolate in winter's night. Third, there is the glass that refills itself whenever the butterbeer is running low.
Of these glasses the greatest is the last - the glass that knows when it's almost empty, the glass that knows to fill itself up. It is this third glass that contains in itself perserverence, determination, courage and willpower. A glass half-empty contains only sour pessimism, while the half-full glass has in it a falsely comforting one-time hope. To refill a glass is a challenge, especially if there seems to be nothing left to fill it up with, but when it is done, the drink will be very much refreshing.
And no matter how far the kitchens are, this glass will find its way to a free flow of creative juices; it will make every hour of its fragile life a happy hour.