chitta (Sanskrit: “memory”;) — derived from the root chit, “to be conscious”. Chitta is the Subconscious mind. It is the mind-stuff. It is the store-house of memory. Samskaras or impressions of actions are imbedded here. It is one of the four parts of antahkarana.
Patañjali defines yoga (in Yoga-Sutra I.2) as chitta-vritti-nirodha (the cessation of mental fluctuations). Vyasa’s commentary on the first sutra in the Samadhi-pada explains that chitta (the thinking substance or principle) has five stages: 1) the restless (ksipta), 2) the torpid (mudha), 3) the distracted (viksipta), 4) the focused (ekagra), and 5) the restricted (niruddha). The first three stages (ksipta, mudha, and viksipta) are not classified as yoga, but the next two stages (ekagra and niruddha) are classified as yoga.
3.1Concentration locks consciousness on a single area
3.2 In meditative absorption, the entire perceptual flow is aligned with that object.
3.3 When on the essential nature of the object shines forth, as if formless, integration has arisen.
3.4 Concentration, absorption and integration reguarding a single object compose the perfect discipline of consciousness.
3.5 Once perfect discipline of the consciousness is mastered, wisdom dawns.
3.17 Word, meaning, and perception tend to get lumped together, each confused with the others; focusing on the distinctions between them with perfect discipline yields insight into the language of all being.
3.24 Focusing with perfect discipline on friendliness, compassion, delight, and equanimity, one is imbued with their energies.
3.31 Focusing with perfect discipline on the pit of the throat eradicates hunger and thirst.
3.36 Experience consists of perceptions in which the luminous aspect of the phenomenal world is mistaken for absolutely pure awareness. Focusing with perfect discipline on the difference properties of each yields insight into the nature of pure awareness.
3.40 By mastering the flow of energy in the head and neck, one can walk through water, mud, thorns, and other obstacles without touching down but rather floating over them.