John identifies the three distinct evils found in the world. It has been said that the chief temptations of the world have always been presented to us under three corresponding aspects: pleasures, riches, and honour.
The battlefield on which we must face our enemy is our own hearts. Satan cannot force us to sin but must persuade us to do his will. The fiercest fight we face is not visible to others.
Why does John state the obvious and tell us that these evils are not of the Father, but of the world? Because he wants to remind us that every time we fall prey to one of these evils, we have let the world back into our hearts and turned away from the Father.