To everything there is a season, and a time to every purpose under the heaven: a time to be born and a time to die; a time to plant, and a time to pluck up that which is planted... a time to weep, and a time to laugh; a time to mourn and a time to dance; a time to cast away stones, and a time to gather stones together...    Ecclesiastes 3:1-8

There is only one purpose in the whole life-- education

Feeling burned out is your body telling you something. When your body is in balance it tells you to rest when it needs rest and it pushes forward when it has purpose and energy. Listen to your body.