Knowledge is the meaning of our lives, and its means is discretion.Rationality and scientificity are necessary for the use of discretion.We can solve even the most difficult mysteries of the world through common sense, which arises from the right use of discretion.India's philosophy of justice answers those questions that arise again and again in our hearts with complete logic and science, through which we can know our true nature. All such questions, such as who God is, what the soul is, what its nature is, what is salvation, what is rebirth, whether are we truly immortal, or are all of these fanciful, must be answered with complete logic and reason. This philosophy gives scientific answers to all these questions.Modern scientists, especially Erwin Schrödinger, Albert Einstein, Werner Heisenberg, etc., easily threaded this discussion of justice philosophy into mathematical formulas. It would not be fair to say that he derived these mathematical formulas from this philosophy, rather, his mathematical formulas told us that knowledge can flourish anywhere in this world and can be represented in different ways.In this book, this great philosophy of India has been written in today's language and perspective so that we can make life meaningful by gaining true knowledge of our nature.