Mbh 6.30.2b

[194] Erecting his seat immovably on a clean spot, not too high nor too low, and spreading over it a piece of cloth, a deer-skin, or blades of Kusa grass, and there seated on that seat, with mind fixed on one object, and restraining the functions of the heart and the senses, one should practise contemplation for the purification of self. Holding body, head, and neck even, unmoved and steady, and casting his glance on the tip of his nose, and without looking about in any of the different directions, with mind in tranquillity, freed from fear, observant of the practices of Brahmacharins, restraining the mind, with heart fixed on me, the devotee should sit down, regarding me as the object of his attainment. Thus applying his soul constantly, the devotee whose heart is restrained, attains to that tranquillity which culminates in final absorption and assimilation with me. Devotion is not one’s, O Arjuna, who eateth much, nor one’s who doth not eat at all; nor one’s who is addicted to too much sleep, nor one’s who is always awake, devotion that is destructive of misery is his who is temperate in food and amusements, who duly exerts himself temperately in all his works, and who is temperate in sleep and vigils. When one’s heart, properly restrained, is fixed on one’s own self, then, indifferent to all objects of desire, he is one called a devotee.[195] As a lamp in a windless spot doth not flicker, even that is the resemblance declared of a devotee whose heart hath been restrained and who applieth his self to abstraction.