The reasoning is thought by certain patterns, according to a certain logic in order to produce knowledge. Logical thinking has multiple connotations, is anaslistis. Streams that use reasoning as a source of truth is called rationalism and which considers the flow fact can be captured through the experience as the truth is called empiricism flow.
Sources of knowledge in this world begins with a dubious human attitude every symptom that is in this universe. Humans do not want to accept only the things that exist, including the fate of her own. Rene Descarte once said
"Omnibus DE DUBITANDUM" which means that everything must be doubted. The issue regarding the criteria for establishing the truth was hard to believe. Of the various streams of the same variety criterion of truth emerges.
