The world of concentration is vast and contains within it myriad skills that can be developed to remarkable degrees. As the number of objects that we can get good with and the many ways we can tune our minds are remarkably complex, it is hard to clearly delineate a simple and manageable inclusive list of all the things we can learn in the vast realms of concentration. However, were we to try, we might start with the following: The speed with which we can get into skillful altered states of awareness (generally called here “concentration states” or “jhanas”). The depth to which we can get into
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