When my naughty student did a good thing, I would praise him. Although his friends said that he only pretended to be good , he deserved to receive compliments from me, his teacher. He did good things so I just praised him. Simple! Maybe because of that he listened to me and tried his best not to miss my class. 

Now, a different situation  I'm a housewife. When my husband praised me, although I know the food that I cooked is not tasty, I feel happy. I will try to cook better food for him. 

So please be generous with praise.