The aim of the article is applying some version of phenomenological speech acts theory into the domain of philosophical (existential) discourse. There are identified various language-mechanisms of existential philosophizing. Especially, locutionary (noematic) and illocutionary (noetic) aspects of acts existentialising are considered. The main thesis of the paper may be formulated in the following words: In acts of existential discourse, the mechanisms of reference determine that an existentialising subject is directed to the mental entities such as illocutionary representations of fears, cares, wastes and other. The predication in such acts of philosophizing is internal and also personal, temporal and sometime virtual.The illocutionary analysis of a fragment of Heidegger's text coming from 'Sein und Zeit' is also presented
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