How many, how much

How many slams in an old screen door?
Depends how loud you shut it.
How many slices in a bread?
Depends on how thin you cut it.
How much good inside a day?
Depends how good you live ‘em.
How much love inside a friend?
Depends how much you give ‘em.
~Shel Silverstein (from A Light in the Attic)