"The Gradual Training" (anupubbasikkhā) is the name given to a series of practices that we should undertake in order to progress on the spiritual path. It appears to be the curriculum for the monks and nuns in the Buddha's sangha. If one were to become a monastic, here are the practices that were to be done. But these practices are also highly applicable to lay practitioners. Multiple of these practices will probably be familiar to anyone who has practiced extensively in any Buddhist tradition.

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Leigh Brasington's other books:
Right Concentration - https://leighb.com/rc
Dependent Origination and Emptiness - http://leighb.com/sodapi