We have two ears, but one mouth so that we may hear more but speak less.
διὰ τοῦτο … δύο ὦτα ἔχομεν, στόμα δὲ ἕν, ἵνα πλείονα μὲν ἀκούωμεν, ἥττονα δὲ λέγωμεν.
Zeno of Citium – Greek philosopher (c. 333-c. 261 BC), from “Lives and Opinions of Eminent Philosophers” (book seven, Zeno of Citium) by Diogenes Laërtius (Greek historian and doxographer, 3rd century)