Chandogya Upanishad
There is a light that shines beyond all things on earth, beyond us all, beyond the heavens, beyond the highest, the very highest heavens.

This is the radiant light that shines in the heart of man.

The whole universe comes from the Higher Spirit, Brahman, and will return to the Spirit. We are creatures of will and we are only what we most deeply desire.
It is our will and our deepest desire in this life that shape the life to come.
So in silence we must direct our deepest desires with prayers, faith and vision to the Spirit, Brahman, to realize our Self.

The Self that dwells in our hearts is the Self that can only be realized in the silence of understanding that we are but Spirit, and that our minds and hearts must be truthful and pure, finding, beyond words, joy in the essence of our being.

The Self dwelling in our hearts is smaller than a grain of rice, smaller than a grain of barley, smaller than a grain of millet, smaller even than the kernel of a grain of millet. But it is greater than the earth, greater than the sky, greater than heaven.
This Self who gives rise to all works, desire, odours, tastes and who embraces the whole universe, who is beyond words, who is pure joy and who is always in your heart is the Higher Spirit, Brahman. When my ego dies and finds its restful place, I will find him.

We should consider that in the inner world Brahman is consciousness, and in the outer world, Brahman is space. These are the two meditations.

Chandogya Upanishad