The Theory of Relativity ...

The Theory of Relativity confers an absolute meaning on a magnitude which in classical theory has only a relative significance: the velocity of light. The velocity of light is to the Theory of Relativity as the elementary quantum of action is to the Quantum Theory: it is its absolute core.
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 Max Planck

Quotes from the same author

It is not the possession of truth, but the success which attends the seeking after it, that enriches the seeker and brings happiness to him.
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 Max Planck
The assumption of an absolute determinism is the essential foundation of every scientific enquiry.
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 Max Planck
We cannot rest and sit down lest we rust and decay. Health is maintained only through work. And as it is with all life so it is with science. We are always struggling from the relative to the absolute.
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 Max Planck
I had always looked upon the search for the absolute as the noblest and most worth while task of science.
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 Max Planck
The spectral density of black body radiation ... represents something absolute, and since the search for the absolutes has always appeared to me to be the highest form of research, I applied myself vigorously to its solution.
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 Max Planck