Without determinate cross-linguistic conceptual identity, the Leibnizian project of encoding universal concepts into a formal notation lacks the stable referential base it requires.

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Conceptual identity(asking whether the same concept exists across different languages and how we know): The idea that two concepts are the same or equivalent despite being expressed differently.
Formal notation(the symbolic language Leibniz wanted to create): A system of symbols and rules (like mathematical equations) used to express ideas precisely and unambiguously.
Leibnizian project(the historical attempt being discussed in the statement): An idea from philosopher Gottfried Leibniz (1646–1716) who believed you could create a universal logical language where all concepts could be expressed symbolically, making reasoning perfect and disputes resolvable through calculation.
Referential base(what's needed for a symbolic system to actually work and mean something): The foundation that allows words or symbols to point to real things or meanings—basically, what gives language its connection to reality.

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