6.11 - 6.12 'In a clean spot,' i.e., in a spot pure in itself, not owned or controlled by impure persons and untouched by impure things; having 'established a firm seat,' a seat made of wood or similar material, which is neither too high nor too low; which is covered with cloth, deer-skin and Kusa grass in the reverse order; seated on it in a way which promotes the serenity of mind; having the mind concentrated on Yoga; and holding the activities of the mind and senses in check in all ways - he should practise 'Yoga', i.e., practise the vision of the self for 'the purification of the self,' i.e., to end his bondage.