The God and The Devil!

 
Alexander Pope said:

"Nature and Nature's law lay hid in night;
God said, let Newton be! and all was light."

 
Then came Einstein with his theory of relativity, and some
wit added the lines:

"But not for long. Let Einstein be! the Devil said,
And lo, 'twas dark: the light had fled."

 From Book Einstein, Kuznetsov.

Historical progress of all sciences..

...the historical progress of all sciences leads only through a multitude of contradictory moves to the real point of departure. Science, unlike other architects, builds not only castles in the air, but may construct separate habitable storeys of the building before laying the foundation stone.

-Marx (A Contribution to the Critique of Political Economy)