Let mourning stop when one's grief is fully expressed.
Faithfulness and sincerity first of all.
There are not the weeds the ones that drown the good seed, but the negligence of the peasant.
Even four harnessed horses cannot bring imprudent words back into the mouth.
Learn as if you were not reaching your goal and as though you were scared of missing it
True knowledge is when one knows the limitations of one's knowledge.