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.
Commentaries and ReflectionsT Krishnamacharya:
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.