Talk about an optimist! Gautama Buddha, the founder of Buddhism, taught his followers to focus on five unchanging truths each day to orient their thoughts. The first three of those five truths are:
1) It is my nature to grow old.
2) It is my nature to get sick.
3) It is my nature to die.
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Jeffrey M. Schwartz, M.D., with Annie Gottlieb and Patrick, A Return to Innocence (New York: ReganBooks, 1998), pp.64-65.