Valmiki Ramayana 5.36.21

सुखानामुचितो नित्यमसुखानामनूचितः ।दुःखमुत्तरमासाद्य कच्चिद्रामो न सीदति॥

sukhānāmucito nityamasukhānāmanūcitaḥ |duḥkhamuttaramāsādya kaccidrāmo na sīdati ||

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