You will never know how sharp a sword is unless it's drawn from its sheath
Study the past if you want to define the future.
Of all that Heaven produces and nourishes, there is none so great as man.
The way you cut your meat reflects the way you live.
When there are duties to perform [true] servants and sons serve their labors.
Look not at what is contrary to propriety; listen not to what is contrary to propriety; speak not what is contrary to propriety; make no movement which is contrary to propriety.