What could be the next reason of World War 3?

I think that if there would be a world war, it could devastate the whole earth. I'm not sure but that's how I think as of the moment. However, there would be a great battle in the future which was predicted, which is called the battle of Armageddon and the battle of Gog and Maggog. It would be the last wars where God will descend from heaven and discomfit the world who gather to make war with Israel. War and more wars will come. There is war in the inside of a person: war between doing good and doing evil. Which one will win in your personal war? It would be great to know.