We can... treat only the ...

We can... treat only the geometrical aspects of mathematics and shall be satisfied in having shown that there is no problem of the truth of geometrical axioms and that no special geometrical visualization exists in mathematics.
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 Hans Reichenbach

Quotes from the same author

Absolute time would exist in a causal structure for which the concept indeterminate as to time order lends to a unique simultaneity, i.e., for which there is no finite interval of time between the departure and return of a first-signal...
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 Hans Reichenbach
Philosophy is regarded by many as inseparable from speculation. ... Philosophy has proceeded from speculation to science.
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 Hans Reichenbach