Joy is there everywhere; it is superfluous, unnecessary; nay, it very often contradicts the most peremptory behests of necessity. It exists to show that the bonds of law can only be explained by love; they are like body and soul. Joy is the realisation of the truth of oneness, the oneness of our soul with the world and of the world-soul with the supreme lover.
It's as though either you accept [religious] doctrine and then you can have all the nice stuff, or you reject the doctrine and you're living in some kind of spiritual wasteland under the guidance of CNN and Walmart.
It means that God's Creation has not its source in any necessity; it comes from his fullness of joy; it is his love that creates, therefore in Creation is his own revealment.
Since everything emanates from God, he is the embodied principle in every being. Each one of us is made from God. Tat twam asi - "You are That One" who is eternally blissful, that one principle manifesting itself as this variety of Creation.
I know, to banish anger altogether from one's breast is a difficult task. It cannot be achieved through pure personal effort. It can be done only by God's grace.