Parshas Bishalach: Rav Shimshon Pincus - Why Bread Needs To Be Fresh
Rav Shimshon Pincus points out an interesting phenomenon. Good bread is fresh bread. Once it gets old, even by a day, it becomes stale. Not so with cake or cookies. Why is that?
Bread is the main food that nourishes life. Cake and cookies are not. When it comes to life, it is refreshed by Hashem every moment of every day. The life given today must be put to use today. If we leave it over, so to say, and do not utilize it, we cannot use it tomorrow. Tomorrow is a new day, with its own gift of life granted from Hashem. Yesterday's unused life is wasted and gone forever.
Rav Avigdor Miller once said that killing time is like murder. Life is made up of minutes, hours, and days. Whatever time you kill is like killing a small part of life. It doesn't make a difference if it is at the end or in the middle.