Mahabharata 12.15.50
नात्यन्तगुणवान्कश्चिन्न चाप्यत्यन्तनिर्गुणःउभयं सर्वकार्येषु दृश्यते साध्वसाधु च
nātyantaguṇavānkaścinna cāpyatyantanirguṇaḥubhayaṃ sarvakāryeṣu dṛśyate sādhvasādhu ca
Our plain-language meaning of this verse is waiting for scholar review.
Open in the book