A collection of teachings from Mahanarayana Upanishad.
The universe emanated in the form of waves from the supreme Fount that is the source of enjoyment to creatures. (Mahanarayana Upanishad Anuvaaka XII, Shloka 8)
Physically speaking,
You and I, the sun, the moon, and the stars are but the little waves or wavelets, foam and bubbles in the midst of an infinite Ocean of matter.
Similarly,
“Both body and mind are but mere names or little Wavelets in the ocean of matter, the ‘Samashti’; Behind that idea of the unity of whole show, The real soul is one. There is but one soul through – out the universe, all is but one existence.
Realization lies in the fact that the ocean is real and its waves are unreal. The bottom of the lake can be seen only in the absence of the waves. Similarly, Self can be realized only when the thought-waves cease.
Source – Book – Manoniyantran: Vedic Views and Ways of Mind Control By Dr Achuta T. N. Rao