Kaivalya Upanishad
Not by work, nor by progeny, nor by wealth, but by devotion to him and by indifference to the world, does a man reach immortality.

Retire into solitude. Seat yourself on a clean spot and in erect posture, with the head and neck in a straight line. Be indifferent to the world. Control all the sense organs. Bow down in devotion to your Guru.

Then enter the lotus of the heart and there meditate on the presence of Brahman—the pure, the infinite, the blissful.

Unmanifest to the senses, beyond all thought, infinite in form, is God.
The seers meditate on him and reach the source of all beings, the witness of all.

He who knows him conquers death. There is no other way to liberation.

The mind may be compared to a firestick, the syllable OM to another. Rub the two sticks together by repeating the sacred word and meditating on Brahman, and the flame of knowledge will be kindled in your heart and all impurities will be burnt away.

He, as the Self, resides in all forms, but is veiled by ignorance. When he is in the state of dream that men call waking, he becomes the individual self… he is happy or miserable because of the creations of his mind.

In the three states of consciousness, whatever appears as the enjoyer or the object of enjoyment, I am the witness thereof, separate from all. I am pure consciousness. I am the eternal Shiva.

I am the knower…. I was not born; I have neither body, nor senses, nor mind, I, the Supreme Self, dwell in the lotus of the heart. I am pure. I am One without a second.

Om Tat Sat

Kaivalya Upanishad