One should continue to perform virtuous rites as long as the health and normalcy of the body is maintained. A sick man is not eager to perform anything even when urged by others.
अध्रुवेण शरीरेण ध्रुवं यो न प्रसाधयेत् ।। ध्रुवं तस्य परिभ्रष्टमध्रुवं नष्टमेव च ।। ४० ।।
If anyone does not try to achieve the permanent through the non-permanent body, the permanent is lost for him and the non-permanent has already perished.