There are two kinds of Riya - Showing off-Ostentation ie pure ostentation and adulterated ostention. In pure ostentation "Riya" a man does a good deed only for worldly benefit. In Adulterated ostentation, a man does a good deed with the intention of reaping the benefits of the world as well as of the Hereafter.
For it is not possible to join serpentine wisdom with columbine innocence, except men know exactly all the conditions of the serpent: his baseness and going upon his belly, his volubility and lubricity, his envy and sting, and the rest; that is, all forms and natures of evil: for without this, virtue lieth open and unfenced.
Even here in America, we felt the cool, refreshing breeze of freedom when Nelson Mandela took the seat of Presidency in his country where formerly he was not even allowed to vote. We were enlarged by tears of pride as we saw Nelson Mandela's former prison guards invited, courteously, by him to watch from the front rows his inauguration.
If we ourselves remain angry and then sing world peace, it has little meaning. First, our individual self must learn peace.
This we can practice. Then we can teach the rest of the world.