“Every day is a good day” is a simple statement, but very few know its real meaning. The “good day” does not refer to a nice day as compared to a bad day. It means the absolute, not the relative, day. Today is the absolute day, the only day in the eternity of time. Today is never repeated. Every day is fresh and new just as one’s life is new each day. Every day is a good day, but the good is not of one’s own making. It is good in the original, or absolute, sense—rain or shine, war or peace, sickness or health. The past is only reference; the future is only hope. Today is real.
From Rev. Gyomay Kubose’s book "Zen Koans."