For one who knows that all is Brahman there is nothing to meditate upon and no one who meditates. — Mahanirvana Tantra.
"Know God, and all fetters will be loosed," declares the Svetasvatara Upanishad. "Ignorance will vanish. Birth, death and rebirth will be no more. Meditate upon Him and transcend physical consciousness. Thus will you reach union with the Lord of the universe. Thus will you become identified with' Him who is One without a second. In Him all your desires will find fulfillment."
When you say I am mortal, you are referring not to me but to the house in which I am living at present. My body is, of course, changing, but I am changeless. As long as I identify myself with my body, senses and mind which are changing, I shall be subject to the great change that is called death. If only I can break through this obsessive identification, I shall then know experimentally that I am changeless, eternal. As Sri Ramana Maharshi would say, when we disidentify ourselves with what is changing, that which remains is changeless Reality.
When we realize God in the depths of our consciousness we pass, here and now, from death to immortality.
When all the senses are stilled, when the mind is at rest, when the intellect wavers not, then, say the wise, is reached the highest state. — Katha Upanishad
The Self is not to be known through study of the Scriptures, nor through the subtlety of the intellect, nor through much learning: But by him who longs for him is he known. Verily unto him does the Self reveal his true being. — Katha Upanishad.
Thinking about sense-objects will attach you to sense objects; grow attached, and you become addicted; thwart your addiction, it turns to anger; be angry, and you confuse your mind; confuse your mind, you forget the lesson of experience; forget experience, you lose discrimination; lose discrimination, and you miss life's only purpose.
Under the tree the shade is pleasant; out in the open the heat is scorching. A person who has been going about in the sun feels cool when he reaches the shade. Someone who keeps on going from the shade into the sun and then back into the shade is a fool. A wise man stays
permanently in the shade. Similarly, the mind of the one who knows the truth does not leave Brahman. The mind of the ignorant, on the contrary, revolves in the world, feeling miserable, and for a little time returns to Brahman to experience happiness. (Sri Ramana Maharshi)