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Part 4: Causality

Lesson 31: Cause and Effect
Lesson 32: The Principle of Causation
Lesson 33: The Causal Relation
Lesson 34: The Causal Relation among Material Things
Lesson 35: The Dependence of the Effect on the Cause
Lesson 36: The Relations of Cause and Effect
Lesson 37: The Principles of Cause and Effect
Lesson 38: The Efficient Cause
Lesson 39: The Final Cause
Lesson 40: The Purposefulness of the Cosmos