Proverbs 23:1-18 (ESV)
23:1 When you sit down to eat with a ruler,
observe carefully what  is before you,
2 and put a knife to your throat
if you are given to appetite.
3 Do not desire his delicacies,
for they are deceptive food.
4 Do not toil to acquire wealth;
be discerning enough to desist.
5 When your eyes light on it, it is gone,
for suddenly it sprouts wings,
flying like an eagle toward heaven.
6 Do not eat the bread of a man who is stingy; 
do not desire his delicacies,
7 for he is like one who is inwardly calculating. 
“Eat and drink!” he says to you,
but his heart is not with you.
8 You will vomit up the morsels that you have eaten,
and waste your pleasant words.
9 Do not speak in the hearing of a fool,
for he will despise the good sense of your words.
10 Do not move an ancient landmark
or enter the fields of the fatherless,
11 for their Redeemer is strong;
he will plead their cause against you.
12 Apply your heart to instruction
and your ear to words of knowledge.
13 Do not withhold discipline from a child;
if you strike him with a rod, he will not die.
14 If you strike him with the rod,
you will save his soul from Sheol.
15 My son, if your heart is wise,
my heart too will be glad.
16 My inmost being  will exult
when your lips speak what is right.
17 Let not your heart envy sinners,
but continue in the fear of the Lord all the day.
18 Surely there is a future,
and your hope will not be cut off.