Yoga Sūtra Chapter Two verse 2

समाधिभावनार्थः क्लेश तनूकरणार्थश्च ॥२॥

samādhi-bhāvana-arthaḥ kleśa-tanū-karaṇa-arthaḥ ca ||2||

Its purpose is cultivating integration,
effecting an attenuation of the afflictions.

samādhi - putting together; communion; combining; integrationbhāvana - cultivation; imagining, fancying; forming in the mind; to occupy one's imagination withartha - purpose, meaning, goalkleśa - afflictions; distress; anguishtanū - attenuationkaraṇa - making, effecting

Commentaries and Reflections

T Krishnamacharya:

“What are the effects of Kriyā Yoga?
Samādhi Bhāvana
The ability to pursue the right practice that brings one closer to Īśvara.
Kleśa Tanū Karaṇa –
Reduction of those obstacles that we have somehow acquired through wrong actions,
leading to undesirable and bitter experiences.”

“If Śarīra leads Ātma, there is Kleśa.
The cause of this is Karma Vāsana and Mithyā Indriya.”

Kriyā Yoga emphasises that the Kleśa cannot be reduced instantly.
It is a gradual process.
Further Kleśa can only be reduced to the limit they become ineffective.
They cannot be destroyed.”

“Only a teacher who has experienced Duḥkha can heal others Duḥkha.”