In plain words
What we say exists does not exist; what we say does not exist, exists. What is, for ever, is God alone; the world is what has turned out not to be: see this, dear one.
From time without beginning, man has been searching for God in many ways. The ancient ṛṣis kept searching for God, doing tapas in dense forests and in mountain caves. But some grew weary and gave up their effort halfway. Others, never letting go of the hold they had taken, kept up their tapas with firm resolve, saw God, and proclaimed to the world, “Vedāham etaṃ puruṣaṃ mahāntam ādityavarṇaṃ tamasaḥ parastāt”, “Beyond the darkness we have been able to see God, whose radiance is like the sun’s.”
Every being is a part of God!
“Bījaṃ māṃ sarvabhūtānāṃ viddhi pārtha sanātanam”, “O Pārtha! Know that I am the seed (the cause) of all beings”: this is the great saying that Kṛṣṇa, who is God, spoke. This very seed takes shape as the tree called the universe, and goes on granting rebirth to all beings. On this tree many branches and twigs grow, and the fruits that are the hosts of living beings come forth. “Mamaivāṃśo jīvaloke jīvabhūtas sanātanaḥ”, “Every being is a part of Me,” said the Teacher of the Gītā. No one exists apart. In every single one, full divinity is present in the form of a seed. In all, it goes on shining.