It was God who created humankind in the beginning, and he left them in the power of their own free choice. If you choose, you can keep the commandments, and to act faithfully is a matter of your own choice. He has placed before you fire and water; stretch out your hand for whichever you choose. Before each person are life and death, and whichever one chooses will be given. (Sirach 15.14-17)
So every now and then I see some supposed scientific reason why free will does not exist. This week it is quantum mechanics that supposedly rules out free will (although I’ve more frequently seen quantum mechanics cited as a reason why freedom is an irreducible aspect of the universe). However, let’s say for argument’s sake that there is a way of conceiving the universe as a completely closed system such that, if we know all inputs, we can accurately predict all outputs. In principle, this means all things are determined and there is no free will (no freedom at all in a strong sense). So what are we to make out of these mutually incompatible conclusions that quantum physics can be enlisted to support EITHER determinacy OR indeterminacy?