Mencius. ca 372 BC - 289 BC. Chinese philosopher and sage.

The compass and square produce perfect circles and squares. By the sages, the human relations are perfectly exhibited.



A Master Mason, in teaching apprentices, makes use of the compasses and the square. We who are engaged in the pursuit of Wisdom must also make use of the compass and the square.
Mencius, Translated by James Legge. Chinese Classics, vol. ii [1895]