write the central idea of fire and ice?

The central idea around which the entire poem revolves is that only love, equality, mutual understanding and sympathy for one and all can help in establishing peace on the Earth. The poet mentions that both fire and ice are probable ends of this world. While he talks about how fire represents desire and can therefore be a cause of the end of the world, he also mentions ice in between to symbolise that the coldness and indifference towards one another will also be enough to end the world.