I will never forget the lesson about my window. Four years ago, I moved to a house in a large town. One of my new neighbors' house was only a few feet away from mine. There lived a woman. Through one of my windows, I could see her reading by her window every afternoon. Several months later, I found I couldn't see the woman clearly. I thought her window was too dirty. I said to myself, "Why doesn't she clean her window? It looks terrible!" One afternoon, I decided to clean my house including the window. I felt tired after three hours of hard work. So I sat down by the window for a rest. What a surprise! I could see the woman reading there clearly again! By that time, I realized that my own window was too dirty, not hers! I really felt _ for myself. I had been watching her through my dirty window in the past days! The experience is very important for me. So I try to clean the window of my heart before judging others. How long has the writer lived in the house according to the passage?
One years Two years. Three years. Four years.