" There is a revealing phrase in English regarding this mind state: we say someone is “plagued by doubt.” Doubt is like a plague that weakens us. When doubt is strong, instead of making the experiment, whether in meditation or anything else, and engaging fully in the experience so that we can see for ourselves whether it is beneficial or not, the mind simply gets lost in endless speculation. "

― Joseph Goldstein , Mindfulness: A Practical Guide to Awakening