8
A friend is not avenged in prosperity, and an enemy is not hidden in adversity. their enemies are in pain, and when they meet with adversity, even friends will keep away.
10
Don't ever trust your enemies; for just as copper corrodes, so their wickedness does as well.
11
If they are humbled and walk away stooped over, look after yourself, and keep up your guard against them. You will be to them as one who polishes a mirror, and you will know that it won't be completely tarnished.