Mahabharata 6.25.4

न कर्मणामनारम्भान्नैष्कर्म्यं पुरुषोऽश्नुतेन च संन्यसनादेव सिद्धिं समधिगच्छति

na karmaṇāmanārambhānnaiṣkarmyaṃ puruṣo'śnutena ca saṃnyasanādeva siddhiṃ samadhigacchati

Our plain-language meaning of this verse is waiting for scholar review.