DESCARTES,RENÉ
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Descartes consistently maintains this position
throughout his work, from the early and unpub-
lished Rules for the Direction of the Mind to the ma-
ture Principles of Philosophy, where article seventy-
six gives divine authority unambiguous precedence
over human reason. Youthful diaries dating from
his years of wandering and soldiering (1618–1620)
reveal a feverish, unconventional, religious imagi-
nation, coupled with devout impulses.
A critical aspect of Descartes’s mature philos-
ophy for issues of science and religion is that his
theory of mind (res cogitans) explicitly privileges
free will over cognition. During an extended stay
in Paris from 1620 to 1627, Descartes had frequent
exchanges with leading religious figures: Marin
Mersenne (1588–1648), who was also educated at
La Flèche; Guillaume Gibieuf, a priest of the Ora-
tory busy writing a book on freedom of the will;
and Cardinal Pierre de Bérulle, who encouraged
Descartes to pursue his reform of philosophy as a
duty and vocation. In Rules for the Direction of the
Mind, composed in the immediate wake of these
meetings, Descartes affirms that revealed truths
are held with even greater certainly than natural
truths since “faith rests, not on an act of intelli-
gence, but an act of will.” He also distinguishes
between cognition as such and the faculty of “af-
firming and denying” in an attempt to explain
error, but the second faculty is not yet clearly
identified with the free will, as it will be in the
Meditations (1641) and in article thirty-two of the
Principles of Philosophy (1644).
In 1628, Descartes moved to Holland in search
of solitude. A letter to Mersenne dated April 15,
1630, reveals the extent to which physics and
metaphysics were indivisibly combined in this
search. Descartes explains that he would not have
discovered the foundations of physics if he had
not started with the rational discovery of self and
God, which is indeed everyone’s “first duty.” God,
Descartes maintains further, is “the first and most
eternal” truth from which “all other truths pro-
ceed.” Most dramatically, Descartes affirms that
eternal truths are created: God has freely decreed
that two and two make four, so that mathematical
truths “depend on God’s will no less than crea-
tures.” By 1630, while solving problems of me-
chanics and conducting dissections in his home,
Descartes thus conceptualized divine freedom, the
new physics, human self-knowledge, and depend-
ence on God as intricately connected.
Cartesian naturalism
When Descartes learned of Galileo’s condemnation
in 1633, he cancelled plans to publish the cosmo-
logical Universe or Treatise on Light designed to un-
veil his new philosophy, citing at a later date “those
whose authority has hardly less power over my ac-
tion than my own reason over my thoughts.” In-
stead, he published the Discourse on the Method
anonymously in Leiden in 1637, along with “sam-
ples” of what his new method could achieve in
geometry, optics and meteorology. Presenting his
proof of self and God as pivotal to his own intel-
lectual awakening, Descartes launches a framework
in which physical phenomena, including biological
phenomena, can be investigated experimentally ac-
cording to materialist principles, while special men-
tal events exhibiting voluntary features and charac-
teristic of human beings are set apart and assigned
to a distinct immaterial principle. In the Discourse,
Descartes proceeds naturalistically in so far as he
cites the empirical evidence of languages to con-
clude that the human “rational soul” is “in no way
drawn from the potentiality of matter” and is there-
fore “not liable” to die with the body.
Cogito and freedom
Objections from all sides greeted Descartes’s radi-
cal move to explain biological phenomena by
means of inert microcorpuscular processes, as well
as Descartes’s bold noetic proof of self (“I think,
therefore I am”) and God. In 1639, desirous to clar-
ify his views and to answer his critics, Descartes
began writing his masterpiece, Meditations on First
Philosophy, published in Paris in 1641. Composed
in Latin, the text of the Meditations is followed by
objections and answers, and is dedicated to Paris
theologians. This time, the reader is led through a
six-day journey of introspection and analysis de-
signed to purge the mind of naïve empiricism, se-
cure new grounds of noetic truth by rooting the
human soul in God, and promote scientific inves-
tigation of the material universe (res extensa) as a
way to cultivate personal happiness while working
for the common good. From the demonic ordeal of
the first day to the orderly reintegration of soul
and body on the last, Descartes’s core concern is to
champion the inalienable gift of freedom that
marks human beings as created in God’s image.
God, Descartes explains, has “left it in my power
not to err” since he is always free to suspend judg-
ment when evidence is insufficient. No evil