"The reason, therefore, that some intuitive minds
are not mathematical is that they cannot at all
turn their attention to the principles of mathematics.
But the reason that mathematicians are not intuitive
is that they do not see what is before them, and that,
accustomed to the exact and plain principles of
mathematics, and not reasoning till they have well
inspected and arranged their principles, they are lost
in matters of intuition where the principles do not
allow of such arrangement. They are scarcely seen;
they are felt rather than seen; there is the greatest
difficulty in making them felt by those who do not
of themselves perceive them."
— Blaise Pascal, Pensées
* Title suggested by a French remark of July 3, 2017