Metaphysical Foundations of the Idea of Tolerance in John Locke's Philosophy

In this paper we will try to identify the concrete ways in which John Locke describes the limits of toleration between different types of faith and its metaphysical foundations. From the beginning of his text A Letter Concerning Toleration, John Locke specifies that toleration is, first and foremost, a practical ideal and, secondly, a moral one. As such, toleration must be the essential feature of the true Church because in the field of religious faith any claimed superiority is in fact only the expression of the struggle for power and domination. A theoretical perspective on the idea of religious toleration is also recalled from Lockeˈs radical empiricism, which correlates man's identity with his appearance at birth, for the first time in the world, as a different form from others. Such a view is contrary to metempsychosis which could lead to innate ideas in the human soul about moral principles and especially about God, as Plato or Descartes believed. Starting from the principles of toleration, John Locke's idea was to find those elements through which a fundamental separation between the Church and the State could be achieved. But toleration ceases when the Church and the State merge discreetly until they can no longer distinguish the boundaries between them. We consider that the fundamental principle of religious toleration is based on the idea of reciprocity, i.e. toleration-to-toleration and intolerance-to-intolerance, as Locke stated. This principle is also an essential landmark for a moral law on religious toleration in the contemporary, global world.