This universe comes forth from Brahmn, or Brahman, and will return to Brahmn. Verily, all is Brahmn.
A person is what his deep desire is. It is our deepest desire in this life that shapes the life to come. So let us direct our deepest desires to realize the Self.
The Self, that can be realized by the pure in heart, is life, light, space, gives rise to all works, desires, odors and all tastes, is beyond words, is joy abiding. This is the Self dwelling in my heart.
Smaller than a grain of rice, smaller than a grain of barley, smaller than a mustard seed, smaller than a grain of millet, smaller even than the kernel of a grain of a millet is the Self. This is the Self dwelling in my heart, greater than the earth, greater than the sky, greater than all the worlds.
This Self that gives rise to all works, desires, odors, and all tastes, pervades the universe, is beyond words, is joy abiding, is ever present in my heart, is Brahmn indeed. To him I shall attain when my ego dies.
Shandilya Rishi in Chandogya Upanishad
(Source: From the Wisdom of Shandilya in Chandogya Upanishad)