As for al-Ghazali’s belief in predestination, it can be
justified by the assumption, perfectly reasonable, that human
thoughts and actions are events in the universe and are subject
to laws according to which the universe functions. This leads to
two possibilities.
First, we may assume a deterministic universe in the sense that
there are laws, discoverable through science, according to which
one state of the universe completely determines all future
states. In particular, all human activities are completely
predetermined by the past states of the universe. There is
nothing inherently irrational about such a deterministic view of
the universe. Indeed, it is a reasonable deduction from the
cause-effect relationship, so important for Hoodbhoy, and has
often been assumed by philosophers and scientists, especially in
the 18th and 19th century. Buoyed by the
initial successes of science to explain the data available at
the time, some scientists believed that everything that happens
in the universe, including human feelings, thoughts, choices,
and actions can be explained, at least in theory, in terms of
the motions of various particles in the human body and elsewhere
in the universe and therefore can be predicted, at least in
theory, using some boundary conditions and the mathematical
equations of physics. There is no real difference between this
view and the belief in predestination, except that the term
“predestination” suggests that human actions are predetermined
not by some boundary conditions and mathematical laws but by
some intelligent agent or God.