Minimum light by day 20 lux, bright enough for birds to be active, causes fewer eye abnormalities.
It is (somewhat) harder to argue that being physically active causes people to trust others in their community.
Not only this, but being active causes your body to release so-called endorphins, which make you feel better and relieve certain kinds of stress.
But defensively, we're doing a phenomenal job of really, really being active, causing some turnovers, blocking some shots, communicating.
So, al-Ghazālī may hold that the fire is a (non-active) cause of the burning, while God is its active cause.
That is, the mind is not the adequate cause of the affect; rather, it responds to some external thing, which can thus be considered the active cause.
Nevertheless, both the tripping and its active cause are required to make it true that the agent intentionally caused himself to trip.
The mind is thus an active cause of all its own ideas, including those that it generates on the occasion of being stimulated by the senses.
His final answer is that both matter and form are principles of individuation: matter as the passive cause (causa receptiva; he also calls it the causa sine qua non), form as the active cause (QLIIS 17, 64).
To return to our earlier example, if Train A moves relative to Train B, we should say, according to Leibniz, that Train A really moves if and only if, it is the active cause of their relative motion.
Since, for Leibniz, being an active cause, or locus of force, is a non-relativistic property attributable to individual bodies, it is in principle capable of breaking the "equivalence of hypotheses" and thus grounding true or genuine motion.
