St. Thomas Aquinas's five proofs for the existence of God are found in his book Summa Theologica. A summary of this text can be found in the eNotes link below.
Aquinas's proofs for the existence of God are used as a classic example of a philosophical argument.
The Five Proofs are as follows:
- Argument from Motion
- Argument from Efficient Causes
- Argument from Possibility and Necessity
- Argument from Gradation of Being
- Argument from Design
These five proofs largely work independently, although to some extent there are crossovers and connections between the arguments.
Another useful resource is the first reference link, which contains an analysis of each proof that may be helpful to you in better understanding each one's logical progression.
St. Thomas Aquinas is renowned for his philosophical works and arguments. Working to understand his "Five Proofs for the Existence of God" will help you progress in your comprehension of philosophical proofs and arguments.