After observation one will come to understand. "All I like in the world is what I have always liked, and all I dislike is what I have always disliked in life." It can be said in other words, "What I know to be loveable I have always loved and all that I don't know I cannot love at once." This shows that ignorance becomes a cover over all that is beautiful and ugly, and knowledge uncovers it. Liking comes from knowledge and dislike from ignorance, although both are necessary.