Filum Cogitationis. Remarks on Leibnizian Projects of a Universal Language

This essay is an attempt to offer at least a partial answer to the question concerning Leibniz's motivation for the need to create a universal language. It is relevant, among other things, due to Leibniz's claim which contradicts the idea of a universal language, in which he clearly stresses that “every language, even the poorest one, can express everything”, as well as owing to Leibniz's historical contribution to the idea of formalization and to the mechanization of the reasoning processes. This paper is also an attempt to reconstruct the paradigm of language research pursued in a specific period of time in 17^th century language theory.