The main two arguments is that
- If an infinite regress is possible then Aquinas is wrong to think that there has to be a starting point or first cause.
- Aquinas’s arguments are self deafeters because if every thing needs a cuase then so does God.
These are frustratingly bad objections because they ultimately present a straw-man of Aquinas’ arguments.
As for the first objection. While i think there are good arguments against the possibility of an infinite regress, there really isn’t any need to argue against that possibility. If you really understand the metaphysics of Aquinas one would understand that a first cause has nothing to do with temporal relationships but rather with metaphysical relationships.
- Each potential effect receives its actuality not from it’s own potential nature but from that which is already actual. Thus, in other-words, in order for a potential nature to exist something other than itself has to actualize its potential because a potential nature cannot actualize itself. **Potential cannot actualize itself.
**
Even if an infinite regress of cause and effect exists, every single cause and effect in that regress begins as a potential being. Thus in order to explain the
existence of an infinite regress one has to posit the existence of a cause that was not itself a “potential being”.
In other-words no being in the infinite regress is the cause of its “
actuality”, every being in the chain receives its actuality, thus the reason for the “existence” of an infinite regress cannot be reduced to the infinite regress itself. Therefore it requires a cause regardless of being infinite.
- As for the idea that everything needs a cause therefore God needs a cause. This is a complete misunderstanding of the argument. This has been tirelessly refuted and yet people continue to make the same mistake.
Every “effect” needs a cause. A being that exists because of its own nature does not require a cause.