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When Albert Einstein was asked about the highest understanding of reality in physics, he said that there are two realities in physics today: one is matter, the other is the field. Both cannot be true, he said, for, the field alone is true.

The field is that in which matter is a bubble. The whole universe is like a few bubbles, that is all. That infinite field, that is the physical truth. That knowledge, which is purely intellectual knowledge, becomes an experiential knowledge through tapas, which Vedanta describes as nirvikalpo hi ayam drstah prapañcopasamo. Not only so,  advayah, 'non-dual'. 

 

~ Swami Ranganathanandaji

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Source: The Universal Message of the Bhagavad Gītā (Volume 1) / Chapter 4: Karma-Sanyasa-Yoga