What things make you sad?

I do not quite know how to explain it but think of a body that is never sick, never tired and more full of life and pleasure than in the brightest hours on earth. 

Then imagine if you can the perfect peace and affection and unselfishness, which are the laws of life here. Then imagine new studies, new opportunities, new surprises, all delightful ones, and a general companionship that fulfills every law of friendship. 

 Then try to be sad or selfish if you can! 

  I cannot! Even with the remnants of my old human temper.