Verse 7

अतो राघव तत्त्वज्ञो व्यवहारेषु संसृतेः ।नष्टं नष्टमुपेक्षस्व प्राप्तं प्राप्तमुपाहर

In plain words

Therefore, Rāghava, as one who knows the truth amid the dealings of saṃsṛti, regard with indifference whatever is lost, and take up whatever comes to you.