Sight is not absolutely essential in this process, but we use sight because it is the dominant sense. It's easiest to interrupt the flow of thought in sense perception and move the mind beyond sense perception with sight.
Frederick LenzWisdom is seeing that there are templates in the universe that you can follow. They will show you what to do and what not to do. In order to see them you have to make your mind very quiet, very still.
Frederick Lenz