De Motus
What is Force?
Part 1
The Nature of Force
Part 2
The Nature of Force
Part 3
Action and Reaction
Section 21
The soul, mind, or spirit is the principle of motion
Section 30
Action and Reaction
Part 4
The Nature of Motion
Part 6
What is Force?
Section 52
What is Force?
Section 60
What is Force?
Section 60