This volume collects a series of letters written by an anonymous author to various German thinkers in the late 18th century. The letters argue for the existence of a moral basis for religion, as opposed to a purely rational or empirical one. The author also engages with the ideas of the philosopher Immanuel Kant, who had recently published his influential work "Critique of Pure Reason". The letters are a fascinating glimpse into the intellectual debates of their time, and they raise important questions about the relationship between morality and faith.

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