Symmetry
The relationship that mattered most to Einstein's ideas was symmetry. Scientists describe symmetry as changes that don't really change anything. More complicated symmetries have led to the discoveries from neutrinos to quarks.
Symmetry is at the root of our description of nature. But symmetry has not been able to explain why gravity is so weak or vacuum energy is so small. The idea of symmetry may be very powerful, but we may have to give up on these principles that have worked so well.
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