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Critical thinking is a type of reasonable, reflective thinking that is aimed at deciding what to believe or what to do. It is a way of deciding whether a claim is always true, sometimes true, partly true, or false. Critical thinking can be traced in Western thought to the Socratic method of Ancient Greece and in the East, to the Buddhist kalama sutta and Abhidharma. Critical thinking is an important component of most professions. It is a part of the formal education process and is increasingly significant as students progress through university to graduate education, although there is debate among educators about its precise meaning and scope.

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Critical thinking is reflective reasoning about beliefs and actions. It is a way of deciding whether a claim is always true, sometimes true, partly true, or false.

Commonly associated with Agnostics and Atheists in their rational, analytical approach to the fallacy of religion.