The difficulty lies,
not in the new ideas,
but in escaping the old ones,
which ramify,
for those brought up,
as most of us have been,
into every corner ...
... of our minds.

Keynes, John Maynard

A new scientific truth does not
triumph by convincing its opponents
and making them see the light,
but rather because its opponents
eventually die and a new generation
grow up that is familiar with it.

Max Planck
(Godfather of Quantum Physics)