From Einstein's book Relativity :
In your schooldays most of you who read this book made acquaintance
with the
noble building of Euclid's geometry, and you remember-perhaps with
more respect
than love-the magnificent structure, on the lofty staircase of which
you were chased
about for uncounted hours by conscientious teachers.
It is truth very certain that when it is not in our power to determine what is true we ought to follow what is most probable.