This sounds like Euripedes, Hippolytus
θάρσει, τέκνον, καὶ μὴ χαλεπῶς
μετάβαλλε δέμας:
ῥᾷον δὲ νόσον μετά θ' ἡσυχίας
καὶ γενναίου λήματος οἴσεις·
μοχθεῖν δὲ βροτοῖσιν ἀνάγκη.
Translating as:
Courage, my child! Do not shift your body so roughly.
You will bear up under your ailment more easily
with calmness and nobility of mind.
Mortals must endure trouble.
In your case:
You must endure trouble.