There is little doubt that vast numbers of spiritual people believe that it is something that can be taught. However, there is also a sense in which spirituality is a personal journey of discovery which means that only certain aspects of it are possible to learn. In other words, there is no single set of skills or practices that you can be taught, which will necessarily lead to a greater spiritual existence. What is needed is a commitment to one's own spiritual journey. In this regard, Buddhists, for example, tend to explain their disciplines as practices that lead onwards on a path towards greater spiritual awareness rather than presenting them as a set of instructions which can be followed like a recipe.
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