nature.

94. The nature of man is wholly natural, omne animal.[18]

There is nothing he may not make natural; there is nothing natural he may
not lose.

95. Memory, joy, are intuitions; and even mathematical propositions become
intuitions, for education produces natural intuitions, and natural
intuitions are erased by education.

96. When we are accustomed to use bad reasons for proving natural effects,
we are not willing to receive good reasons when they are discovered. An
example may be given from the circulation of the blood as a reason why the
vein swells below the ligature.

97. The most important affair in life is the choice of a calling; chance
decides it. Custom makes men masons, soldiers, slaters. "He is a good
slater," says one, and, speaking of soldiers, remarks, "They are perfect
fools." But others affirm, "There is nothing great but war; the rest of men
are good for nothing." We choose our callings according as we hear this or
that praised or despised in our childhood, for we naturally love truth and
hate folly. These words move us; the only error is in their application. So
great is the force of custom that, out of those whom nature has only made
men, are created all conditions of men. For some districts are full of
masons, others of soldiers, etc. Certainly nature is not so uniform. It is
custom then which does this, for it constrains nature. But sometimes nature
gains the ascendancy and p