Kindness is the teaching of Almighty. Be kind to everything without excepting any rewards. Not only show kindness to other person but also showing to nature around you. Kindness can make you a nice guy.
Be gentle to everything around you, it may be a person or animal. Show kindness especially to the poor animals around you by feeding them. Be humble with that helpless animal around you. They may not need food all the time but they need your kindness.
Be kind and you will never find that much happier when they gave you nice gestures.