In a battle, while a soldier was preparing to bring back his wounded friend from the field. Seeing this his captain said, "Its of no use, your friends must be dead by time you reach him."But soldier still goes and bring back his friend. Seeing dead body of his friend on his shoulder captain said, "I told you it would be worthless as he's dead."To this soldier replied with moist eyes "Sir, it was really worth to go back and get him."When I got him, he looked at me and smiled and said his last words. "I knew you would come." 
Some people are worth taking risk and always value feelings of friends and family and be there. Even a small act can be reason for someone smile. 