Sirach.
Chapter 8.
Don’t contend with a mighty man, lest perhaps you fall into his hands. 
Don’t strive with a rich man, lest perhaps he overpower you; for gold has destroyed many, and turned away the hearts of kings. 
Don’t argue with a loudmouthed man. Don’t heap wood upon his fire. 
Don’t make fun of a rude man, lest your ancestors be dishonoured. 
Don’t reproach a man when he turns from sin. Remember that we are all worthy of punishment. 
Don’t dishonour a man in his old age, for some of us are also growing old. 
Don’t rejoice over anyone’s death. Remember that we all die. 
Don’t neglect the discourse of the wise. Be conversant with their proverbs; for from them you will learn discipline and how to serve great men. 
Don’t miss the discourse of the aged, for they also learnt from their parents, because from them you will learn understanding, and to give an answer in time of need. 
Don’t kindle the coals of a sinner, lest you be burnt with the flame of his fire. 
Don’t rise up from the presence of an insolent man, lest he lie in wait as an ambush for your mouth. 
Don’t lend to a man who is stronger than you; and if you lend, count it as a loss. 
Don’t be surety beyond your means. If you give surety, think as one who will have to pay. 
Don’t go to law with a judge; for according to his honour they will give judgement for him. 
Don’t travel with a reckless man, lest he be burdensome to you; for he will do as he pleases, and you will perish with his folly. 
Don’t fight with a wrathful man. Don’t travel with him through the desert, for blood is as nothing in his sight. Where there is no help, he will overthrow you. 
Don’t consult with a fool, for he will not be able to keep a secret. 
Do no secret thing before a stranger, for you don’t know what it will cause. 
Don’t open your heart to every man. Don’t let him return you a favour. 
