Whoever has his foe at his mercy, and does not kill him, is his own enemy

O wise man, wash your hands of that friend who associates with your enemies

A scholar without diligence is a lover without money

Take care what you say before a wall, as you cannot tell who may be behind it

However much you are read in theory, if thou hast no practice thou art ignorant

The rose and the thorn, and sorrow and gladness are linked together