Until men attain the age of one hundred years these evil spirits continue to persecute them. Afterwards fever becomes the only evil spirit that affects human beings.
यावत् सप्ततिवर्षाणि भवन्त्येते ग्रहा नृणाम्। अतः परं देहिनां तु ग्रहतुल्यो भवेज्ज्वरः॥