Why do the humans get the feelings of love,emotion rage and joy ?

Because the experiences led the knowledge that nothing is parmanent in this temporary world.

What does a man grain remaining good and honest throughout the life ?

Vertrue ,that separate him from a dishonest man even in this life and the life after death.

Ok,tell me , what makes the human the lord of this world over the other animals.

His power of reasoning or understanding.