The article examines the linguo-cognitive level of the linguistic personality of Andrei Bely, one of the key poets of Russian Symbolism. The relevance of this work stems from the contemporary linguistics interest in the ways of representing the author’s individual worldview in literary texts. The study identifies the specific verbalizations of key concepts in his poetry collections “Gold in Azure”, “Ashes”, and “Urn”, reflecting the evolution of the poet’s outlook. Our study is based on the poems from these cycles; the methodological basis is conceptual and linguacognitive analyses and Yu. Karaulov’s theoretical propositions on the structure of the linguistic personality. The study traces the dynamics of the poet’s worldview: From the mystical optimism of his early works with the images of gold and azure to the tragic perception of reality in “Ashes” and “Urn”, dominated by motifs of ash, destruction, and existential anxiety. The linguo-cognitive level of Bely’s linguistic personality is characterized by dualism: A striving for the sacred combined with a deep experience of Russia’s historical tragedy, the fate of its people, and his own spiritual crisis. Special attention is paid to the transformation of the key images and concepts, reflecting the poet’s intense philosophical quest. The findings contribute to the study of Andrei Bely’s poetic worldview and to the development of methods for analyzing the linguistic personality within cognitive linguistics.