Truth, independent of the Self, is irrelevant to the biological existence of human life.

The perception of reality is something that is constructed by the human mind based on its own needs and knacks.

Truth in the human world, is constructed, defined and then reconstructed by the human self.

Every living creature on this planet, has a conscious subjective perspective of the world. Even the plants may seem to us as standing indifferent to the human sufferings, but even they have their own unique mental universe. They have their own way of interacting with the environment.

Reality is a construct of the neurons.

Say, there is a book written by Tolstoy sitting right there on the table. To our unique human consciousness, the reality of the papers in the book, is infinitely different from the valuable literature that they possess. For the kind of consciousness possessed by the bug which eats those papers, literature is non-existent, yet for the Human Consciousness, literature has a greater value of truth than the papers themselves.