John and Mary, a young couple, had just moved into a new neighborhood. One morning while they were eating breakfast, Mary sees her neighbor hanging the wash outside to dry.
"That laundry is not very clean" Mary scoffed. "She doesn't know how to wash correctly. Perhaps she needs better laundry soap".
John looked on, but remained silent.
Every time Mary's neighbor would hang her wash out to dry, Mary would make the same comments.
About a month later, Mary was surprised to see nice clean wash on the line and said to her husband, "Look, she has learned how to wash correctly. I wonder who taught her?"
John replied, "I got up early this morning and cleaned our windows."
And so it is with life. What we see when watching others depends on the purity of the window through which we look.