yathā dīpo nivāta-stho neṅgate sopamā smṛitā
yogino yata-chittasya yuñjato yogam ātmanaḥ ||19||             

yatroparamate chittaṁ niruddhaṁ yoga-sevayā
yatra chaivātmanātmānaṁ paśhyann ātmani tuṣhyati||20||     

sukham ātyantikaṁ yat tad buddhi-grāhyam atīndriyam
vetti yatra na chaivāyaṁ sthitaśh chalati tattvataḥ||21||

Meaning : Like a lamp placed in a windless spot that does not flicker, so is the mind of the yogi who controls it and engages in yoga. Where the mind, restrained by the practice of yoga, sees the Self by the Self and is satisfied in the Self alone. That highest happiness which transcends the intellect and the senses, is known by one whose mind is steady and does not move from the truth.