Bhagavad Gītā Chapter Six verse 6

bandhur ātmā ’tmanas tasya yenātmāivātmanā jitaḥ |
anātmanas tu śatrutve vartetātmāiva śatruvat ||

citta - psyche; heart as the seat of feelings and sensationsātman - essence; the highest personal principle of lifeanātman - other than essence

Commentaries and Reflections

T Krishnamacharya:

When dominated by KleśaCitta is not a friend.

TKV Desikachar:

Only the Citta is the cause for Bandhana or Mokṣa.