Jesus was likely fluent in Hebrew, Aramaic, Greek, and Latin. He was a perfect human with a perfect mind, after all. Aramaic was the common language where he grew up, with Greek being the lingua franca for the Roman Empire as a whole, and Hebrew did not begin to wane in Palestine until after the destruction of Jerusalem by Rome in 70 C.E. The synagogues used the Hebrew text. Jesus could have taught in Greek at times if the need arose. However, as the article shows, it is much more complex than this, as complex as this may sound.