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 LenzThe body comes and goes. This life, my friend, will come and go. It is a fleeting moment, an impulse in an eternal reality.
Frederick LenzSome tried to kill him; there were assassination attempts. Some hated him ... this is par for the course.
Frederick LenzThe population of the planet is increasing at an alarming rate, and yet each day human beings manage to destroy ten species.
Frederick Lenz