Rationalism is philosophic direction,which sees mind as a basis of people behaviour,rationalism actually was present in ancient greek philosophy,it`s divied knowledge ,which came from the mind,a knowledge,which appeared through sensual perception,in the 17-18 centuries rationalism,claimed that mind`s role is important not only in understanding,but also in people`s activities,and it was one the philospohical sources of the elightenment ideaology,rationalism was absolutely sure about certainty of scientific principles and mathematics indexes and natural science,and rationalism tried to answer on the question,how knowledge,gained in the process of individual`s acitivity gets objective and necessary character,so it meant that scientific knowledge should be gained by usage of mind,not by sensual perception.One of the founders of of rationalism was Rene Dekart,firstly he works out philosophical tradition,he supposes whether is it possible to doubt logically in our sensual perception,because sometimes we face illusions,for example the tower at first sight can be round shaped,but in reality it is rectangular,so our feelings cannot provide something real.,Dekart said”If persons is able to thinks,then he/she exists,so our sensual perception should be controlled by a mind,that menas the real truth is what mind in the result of systematic analysis defines as a truth.…