The Ultimate Truth can be found in the Teaching of the Buddhism. Buddhism recognizes two kinds of Truth. The apparent conventional truth and the real or ultimate Truth. The ultimate Truth can be realized only through meditation, and not theorizing or speculating.
Teaching is the Ultimate Truth of the world.
Buddhism, however, is not a revealed or an organized religion. It is the first example of the purely scientific approach applied to questions concerning the ultimate nature of existence. This timeless Teaching was discovered by the Buddha Himself without the help of any divine agency. This same teaching is strong enough to face any challenge without changing the basic principles of the doctrine. Any religion that is forced to change or adjust its original Teachings to suit the modern world, is a religion that has no firm foundation and no ultimate truth in it.