Musar על סנהדרין 47:27

And our sages, of blessed memory, said "a sign of arrogance is poverty of Torah" (Sanhedrin 24a). And likewise they said: "a sign of not knowing anything is self-praise" (Zohar Balak 49b); and "one coin in a pitcher cries out 'rattle, rattle'" (Bava Metzia 85b); and "the barren trees were asked: 'why are your voices heard?' they replied: 'would that it were that our voices will be heard and we will be remembered'" (Bereishis Raba 16:3).