मनोऽप्रसादः पुरुषस्य बन्धोमनःप्रसादो भवबन्धमुक्तिः ।मनःप्रसादाधिगमाय तस्मा -न्मनोनिरासं विदधीत विद्वान् ॥ ३७४ ॥
In plain words
An unquiet mind — that is your bondage. A mind gone clear is release from the whole round of birth and death. So, to reach that clarity, the one who knows sets about dissolving the mind itself.
Close to the Sanskrit
Non-serenity of the mind is bondage for a person; serenity of the mind is release from the bondage of worldly existence. Therefore, for the attaining of the mind's serenity, the knower should undertake the casting out of the mind.