Crescit eundo is taken from
Lucretius's De Rerum Natura (VI, 340), where it describes the thunderbolt (fulgur) growing more powerful as it travels through the sky. The phrase became
the motto of New Mexico when it joined the United States in 1912, applied to the state's growth. Students should note the physical phenomenon that Lucretius describes: the thunderbolt generates a vacuum as it moves, into which more air rushes, feeding the electrical charge and making it more powerful. This physical model of self-reinforcing momentum is the literal basis for the metaphorical uses. In poetic terms, crescit eundo describes the phenomenon of the poem that gathers imaginative force as it develops — where each line or stanza draws energy from what preceded it and amplifies it. Related terms include the sublime (which is related to the overwhelming experience of accumulated power), anaphora (the rhetorical repetition that generates cumulative force), and the concept of narrative momentum.