I no Naka no Kawazu[Taikai o Shirazu] "A frog in the well[doesn't know the sea]."

Used to advocate greater travel beyond the Japanese islands, it captures the Japanese sense of awareness of being like a frog in a well. Comfortable as the well may be, it is but a small part of the whole world. Japanese teachers often recite this proverb to encourage their students to progress beyond the circumstances into which they were born.