Years ago, I lived in a building in a large city. There was another building not far from mine. A woman lived there. I had never met her, but I could see her sit by the window each afternoon, sewing or reading. After several months, I began to notice that her window was dirty. Everything was unclear through the dirty window. I would say to myself, "What a lazy woman! I wonder why she doesn't wash her window. It really looks terrible." One bright morning, I decided to clean my flat, including the windows.  When I finally finished the cleaning, I sat down by the window for a rest. What a surprise! Everything in the woman's flat could be seen clearly. Her window was clean! I began to understand. I watched the woman's window from my own dirty window. That's the problem! That is quite an important lesson for me. How often do I look at and criticize others through the dirty window of my heart? From then on, whenever I want to _ someone, I ask myself first, "Am I looking at him through my dirty window?" Then I try to clean the window of my own world so that I may see others' world more clearly. What can we learn from the passage?
one shouldn't criticize others very often. one should look at others through his dirty windows. one should often keep his windows clean. one should judge himself before he judges others.