స్వామి శివానంద సూక్తి

Who is a Dheera? Not the Brigadier in the Army who has won many battles or one who has died on the battlefield. He is of a Rajasic type. He and he alone is a Dheera who can withdraw his mind and senses from the external object and direct them inward. This is Pratyahara. It is one of the Angas of Raja Yoga. You should first have physical discipline. Then comes ethical discipline: Ahimsa, Satyam, Brahmacharya, Self-restraint and observances. The spiritual seed the Yoga-seed, must be sown now, when you are young.

- Swami Sivananda