Verse 21

किंत्वसौ मरणावेशयायिन्या नस्त्वया सुतः ।याचितः कृच्छ्रं संप्राप्य ज्ञाता तेन भविष्यति

In plain words

But this son, begged of us by you as you were entering into the grip of death — he, having met with hardship, will through that become a knower.'