Eka Eva Hi Bhootaatmaa Bhute Bhute Vyavasthitah.
Ekadhaa Bahudhaa Chaiva Drishyate Jalachandravat.
(From Amrit Bindu Upanishad. 12)
The atman in all (beings) is of the same essence. Just as the moon reflected in many (pots) of water appears to be many but actually there is only one moon.