Mahabharata 12.156.19

धृतिर्नाम सुखे दुःखे यथा नाप्नोति विक्रियाम्तां भजेत सदा प्राज्ञो य इच्छेद्भूतिमात्मनः

dhṛtirnāma sukhe duḥkhe yathā nāpnoti vikriyāmtāṃ bhajeta sadā prājño ya icchedbhūtimātmanaḥ

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