Yoga Sūtra Chapter Three verse 10

तस्य प्रशान्तवाहिता संस्कारत् ॥१०॥

tasya praśānta-vāhitā saṃskārāt ||10||

Of this tendency a serene flow.

tasya - its, of it, of thispraśānta - serene, tranquillized, calm, quiet, composed, indifferentvāhitā - flowsaṃskāra - tendencies, psychological imprint, mental impression, habitual potency; making sacred, hallowing, consecration, making ready, preparation; a sacred or sanctifying ceremony