by philosophy
and experience? The age is enlightened, that is to say, that knowledge,
obtained and vulgarized, suffices to set right at least on practical
principles. The spirit of free inquiry has dissipated the erroneous
opinions which long barred the access to truth, and has undermined the
ground on which fanaticism and deception had erected their throne.
Reason has purified itself from the illusions of the senses and from a
mendacious sophistry, and philosophy herself raises her voice and exhorts
us to return to the bosom of nature, to which she had first made us
unfaithful. Whence then is it that we remain still barbarians?

There must be something in the spirit of man--as it is not in the objects
themselves--which prevents us from receiving the truth, notwithstanding
the brilliant light she diffuses, and from accepting her, whatever may be
her strength for producing conviction. This something was perceived and
expressed by an ancient sage in this very significant maxim: sapere aude
[dare to be wise.]

Dare to be wise! A spirited courage is required to triumph over the
impediments that the indolence of nature as well as the cowardice of the
heart oppose to our instruction. It was not without reason that the
ancient Mythos made Minerva issue fully armed from the head of Jupiter,
for it is with warfare that this instruction commences. From its very
outset it has to sustain a hard fight against the senses, which do not
like to be roused from their easy slumber. The greater part of men are
much too exhausted and enervated by their struggle with want to be able
to engage in a new and severe contest with error. Satisfied if they
themselves can escape from the hard labor of thought, they willingly
abandon to others the guardianship of their thoughts. And if it happens
that nobler necessities agitate their soul, they cling with a greedy
faith to the formula that the state and the church hold in reserve for
such cases. If these unhappy men deserve our compassion, those others
deserve our just contempt, who, though set free from those necessities by
more fortunate circumstances, yet willingly bend to their yoke. These
latter persons prefer this twilight of obscure ideas, where the feelings
have more intensity, and the imagination can at will create convenient
chimeras, to the rays of truth which put to flight the pleasant illusions
of their dreams. They have founded the whole structure of their
happiness on these very illus