Those that indulge in sorrow, know no happiness; and their virtue* goeth out of them. Therefore it behoveth you not to grieve. In the sense of energy.
ये शोकमनुवर्तन्ते न तेषां विद्यते सुखम्। तेजश्च क्षीयते तेषां न त्वं शोचितुमर्हसि ॥