As a solid rock is not shaken by the wind, wise people falter not amidst blame and praise.
Selo yathā ekaghano, vātena na samīrati; Evaṁ nindāpasaṁsāsu, na samiñjanti paṇḍitā.
Dhammapada 81
The same idea in other traditions
And let us not be weary in well doing: for in due season we shall reap, if we faint not.
Wait on the LORD; Be strong, and let thy heart take courage; Yea, wait thou for the LORD.
The Master said, "The superior man is satisfied and composed; the mean man is always full of distress."
To a monk who has left his sons and wives, and who has ceased to act, nothing pleasant can occur, nor anything unpleasant.
O ye who believe! Persevere in patience and constancy; vie in such perseverance; strengthen each other; and fear Allah; that ye may prosper.
One who is not affected by pleasure or pain, who looks upon friend and enemy alike - says Nanak, listen, mind: know that such a person is liberated.
He through whom the world is not agitated, and who is not agitated by the world, who is free from joy and anger and fear and agitation, he too is dear to me.
There is the great Mass (of nature);--I find the support of my body on it; my life is spent in toil on it; my old age seeks ease on it; at death I find rest in it;--what makes my life a good makes my death also a good. …
The bird of gardens sang unto the rose, / New blown in the clear dawn: “Bow down thy head! / As fair as thou within this garden close, / Many have bloomed and died.” She laughed and said: / “That I am born to fade grieves not my heart; / But never was it a true lover’s part / To vex with bitter words his love’s repose.” …