What will bring peace to the world?

Probably nothing. To be peace, there musn't be stress, jobs, money, or any of that stuff. And unless everything is suddenly for free and money isn't an issue, there will never be peace in the world.

There will be many challenges and deaths and incomplete journeys before anyone will ever decide that it is the right time for peace. Since not one person in the world has ever been flawless, peace has never been achieved. As the world grows older, people will disappear and appear again until there is no more universe, no more earth. We can try to help one another and love each other, hard as it is, but world peace is infinitely complicated and impossible.

^

Actually, this person does not really describe peace, therefore he/she isn't too sure about what exactly it is. So they can't really help your all that much. Here is a quote that might help you though. Here it is:

Peace, It does not mean to be in a place of no noise, trouble, or hard work. It means to be in the midst of those things and still be calm in your heart. <3