I found this little poem and thought it was quite wise...
If you can sit quietly after difficult news,
If in financial downtimes you can remain perfectly calm,
If you can love unconditionally and see your neighbors travel to fantastic places without a twinge of jealousy,
If you can happily eat whatever is put on your plate,
And if you can fall asleep after a day of running around without a drink or a pill,
If you can always find contentment wherever you are,
you are probably a dog.