Mencius - Book 6, Part 1, Chapter 20

Mencius said, 'Î, in teaching men to shoot, made it a rule to draw the bow to the full, and his pupils also did the same.

'A master-workman, in teaching others, uses the compass and square, and his pupils do the same.'

~ James Legge translation via nothingistic.org ~

 Go here to read the introductory post to this serialized version of the Works of Mencius.