Hathayoga 1-16

उत्साहात्साहसाद्धैर्यात्तत्त्व-ज्ञानाश्च निश्चयात् ।

जन-सङ्ग-परित्यागात्षड्भिर्योगः प्रसिद्ध्यति ॥ १६॥

Utsāhātsāhasāddhairyāttattvajñānāścha niśchayāt janasangghaparityāghātshadbhiryogah prasiddhyati

The following six bring speedy success: Courage, daring, perseverance, discriminative knowledge, faith, aloofness from company.