Esse quam videri is
the motto of North Carolina (Esse Quam Videri, adopted 1893) and derives from Cicero's De Amicitia (XXVI, 98), where it appears in the context of a discussion of true friendship. Students should note that Cicero attributes the sentiment to Cato the Elder (not Cato the Younger, who adopted it as his motto), and that in context it is specifically about the difference between a true friend and a flatterer: the flatterer videtur (seems) but does not esse (is). This context is important for understanding the phrase's use in poetry: it is not just a general preference for authenticity but a specific warning about the dangers of those who perform virtue without possessing it. The phrase is also relevant to discussions of persona in poetry:
the mask or persona through which
a poet speaks may videri (seem) without that appearance exhausting the esse (being) of the poet behind the mask.