Found at Aspiring Community:
 
A LITTLE WALK AROUND YOURSELF
      When you're criticizing others
      And are finding here and there
      A fault or two to speak of
      Or a weakness you can't bear
      When you're blaming someone's weakness
      Or accusing some of pelf...
      It's time that you went out
      To walk around yourself.
      There are lots of human failures
      In the average of us all
      And lots of grave shortcomings
      In the short ones and the tall
      But when we think of evils
      Men should lay upon the shelves...
      It's time we all went out
      To walk around ourselves.
      We need so often in this life
      The balancing of scales
      This seeing how much in us wins
      And how much in us fails
      But before you judge another
      Just lay him on the shelf...
      It would be a splendid plan
      To walk around yourself.

      Author Unknown