Augustine’s mental exercise, making an analogy between three aspects of human life that inseparably operate together while remaining distinct, later becomes the basis for his work
On the Trinity, which he began writing within a couple years of writing
Confessions in the late 390s but did not finish until the 420s. Even though Augustine consistently maintains that doctrines as transcendent as the Trinity must be believed by faith and will only be understood rightly when a Christian beholds God in heaven, he also upholds the value of human analogies for humbly trying to understand them.