What is the ultimate truth? It is one of the most toughest question to explain. Let me try to explain contextually. We live in planet earth, as for we know, we are the only intelligent living being. Planet earth is around 4.54 billion years old. We are part of solar system and sun is our star. There are billions of stars in the Milky way galaxy. There are billions of galaxies like Milky way in the universe. Our universe is around 13 billion years old. Universe was formed by the big bang. There could be billions of universe but we do not know. Who triggered big bang, we do not know, what happened before big bang, we do not know. Why energy released in quanta, we do not know. There are lots of questions we do not know the answers.
Humans are around for last 30,000 years and only in last 100 years the modern human made a significant progress in understanding few basics in the entire human history. Putting things into perspective, our earth was 4.54 billion years old but human have been living only for last 30,000 years. There is a astronomical variance between our existence and earth formation. Are we the bug fix to the earth system when it failed with dynos. Who architected the whole sysetm, who designed it, who made the error and who fixed it? Lots of questions but no answers. Theologians always have one word answer for every questions listed here.
So, what is the ultimate truth? It is an understanding of our existence in the system. In my opinion, I do not think any one can answer this simple question, why do we exist? What is the purpose? This is very profound question need enlightenment to find answer for this questions.
Why do we exist and what is our purpose? I believe ancient people were trying to answer this questions and they might have reached closer to the answer than what we know today. I believe the ancients followed a meditation technique to consciously listen to the inner sub conscious. How a conscious mind can listen to subconscious mind? It may appear as a conflict statement. But I believe, it is possible and ancient followed that technique. (Some of the Monks in Tibet may be following the same technique). Consciously listening to the self (self discovery) is a path to seek the ultimate truth.
What is the path ?
Just listen to your self. Do nothing, consciously, attentively watch your mind. Based on number of nodes in each network of your neurons, depth of the network, weight assigned in each node of your network, your conscious mind will slowly fade away and at one point you will attain no mind state. At that state, you (the body) and your spirit (the observer) alone will be there. If you keep doing it, you and your sub conscious mind (spirit) will become integral and the observer will observe the observer. You will find and listen to your inner sub conscious mind (spirit)
Why it is a dangerous path?
There are easy answers for difficult questions. Normally, humans tend to find a difficult answer for an easy question. Complication is a necessary evil in an ordinary human life. The moment humans find an easy way out for difficult questions (what is fear, why do we fear, what is sorrow, why sometimes we feel down, etc) there is an extreme joy (bliss) within. That is the first lick of a powerful drug, the first moment of natural bliss. It will become an addiction. You want more. You will find answers for questions like who are you? and what is the purpose of the existence? You will become detached to the materialistic world. You do not need food, you only need water, weather condition does not bother you (you can live on street even if the temperature is below 20), you will become unmotivated, unenthusiastic about any thing (you will realize happiness is also a human problem like fear, sorrow). It is a dangerous path from materialistic world stand point. The moment you enter the gateway, you would not come to the materialistic world.
The person who found the ultimate truth will not come to materialistic world and the people who claim they found the ultimate truth did not really find it.