From Iyengar’s “The Tree of Yoga,” p. 73
You are a beginner in yoga. I too am a beginner from where I left my practice yesterday. I don’t bring yesterday’s poses to today’s practice. I know yesterday’s poses, but when I practise today I become a beginner. I don’t want yesterday’s experience. I want to see what new understanding may come in addition to what I had felt up to now. In this quest, my body is my bow, my intelligence is my arrow, and my target is my self. I am aware inside and I am aware outside. We must learn to stretch the bow well before we can hit the target, so go on extending the bow of your body. Then the arrow of your intelligence will become sharp, and when you release the arrow, it will hit the target, which is your soul. Don’t worry about the target. When the bow is stretched well and the arrow is sharp, you will hit it.
From Patanjali’s Yoga Sutras, Vibhuti Pada
bahih akalpita vrittih maha-videha tatah prakasha avarana ksayah
When the formless thought patterns of mind are projected outside of the body, it is called maha-videha, a great disincarnate one. By samyama on that outward projection, the veil over the spiritual light is removed.
grahana svarupa asmita anvaya arthavattva samyamad indriya jayah
By samyama on the process of perception and action, essence, I-ness, connectedness, and purposefulness of senses and acts, mastery over those senses and acts (indriyas) is attained.