Thomas Aquinas, The argument from Efficient Causality

The argument from Efficient Causality :

1. There are efficient causes in the world (i.e, producing causes).
2. Nothing can be the efficient cause of itself, for it would have to be prior to itself in order to cause itself.
3. There cannot be an infinite regress of (essentially related) efficient causes, for unless there is a first cause of the series there would be no causality in the series.
4. Therefore, there must be a first, uncaused, efficient Cause of all efficient causality in the world.
5. Everyone gives to  this name the name of God.

https://www.youtube.com/watch?v=OhAxN4pCjp4