Relative and absolute truth ...

The Nondual Absolute Reality in Itself - Shunyata, Paramatman, Tao, Buddha-nature, etc - is the Supreme Ground of all Reality. Its attainment is experienced as Nirvana or Liberation or Self-Realization. The opposite of this state is the world of phenomena, Maya, the relative truth, Illusion, Samsara, subject to Ignorance (avidya) of one's True Nature, craving, unhappiness, and so on.

That's why the various Indian philosophies (Vedanta, Mahayana, etc) speak of the "Two Truths", the Relative and the Absolute Truth. Hence Enlightenment (realisation of the Absolute) is not something to be attained, because one always was and is the Absolute. Enlightenment is simply the realisation that you are the Absolute right now, and that there is no birth or death, future or past, self or other, but only the eternal present, the one universal "I"

-- Picture: Eye of God - Helix nebula, NGC7293