Research on the Upanishads ...

"The multiplicity is only apparent. This is the doctrine of the Upanishads. And not of the Upanishads only. The mystical experience of the union with God regularly leads to this view, unless strong prejudices stand in the West." - Erwin Schrödinger, quantum physicist.

German philosopher Arthur Schopenhauer, impressed by the Upanishads, called the texts "the production of the highest human wisdom".

"It has been the solace of my life, it will be the solace of my death."
--- Arthur Schopenhauer on the Upanishads.