Mahabharata 12.308.30

ज्ञानेन कुरुते यत्नं यत्नेन प्राप्यते महत्महद्द्वंद्वप्रमोक्षाय सा सिद्धिर्या वयोतिगा

jñānena kurute yatnaṃ yatnena prāpyate mahatmahaddvaṃdvapramokṣāya sā siddhiryā vayotigā

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