A man called Ali is in need of money and asks his boss to help him. His Boss sets him a challenge: if he can spend all night at the top of a mountain, he will receive a great reward; if he fails, he will have to work for free. When he left the shop, Ali noticed that an icy wind was blowing. He felt afraid and decided to ask his best friend, Aydi, if he thought he was mad to accept the wager.
After considering the matter for a moment Aydi answered, " Don't worry, I'll help you. Tomorrow night, when you're sitting on top of the mountain, look straight ahead. I'll be on top of the mountain opposite, where I'll keep a fire burning all night for you. Look at the fire and think of our friendship, and that will keep you warm. You'll make it through the night, and afterward, I'll ask you for something in return.
Ali won the wager, got the money, and went to his friend's house.
"you said you wanted some sort of payment in return." Aydi said, "Yes, but it isn't money. Promise that if ever a cold wind blows through my life, you will light the fire of friendship for me

Paulo Coelho