Proverbs 24:28-29 let us know that God is not happy with the phrase, "I don't get back, I get even."  Revenge is not a good thing. 

Prov 16:11
Honest scales and balances are from the LORD; all the weights in the bag are of his making.

God judges according to His standard. When we stand before the throne at the judgment, He will balance the scales. It will make no difference how much or how little our sins may be on our side of the scales; Jesus balances them by His shed blood. What an amazing Savior we have!

Prov 22:28
Do not move an ancient boundary stone set up by your forefathers.

Ps 16:6
The boundary lines have fallen for me in pleasant places; surely I have a delightful inheritance.

Praise God, He has set boundaries for us. To know where those boundaries are, we only need to go to the "ancient paths"

Jer 6:16
This is what the LORD says: "Stand at the crossroads and look; ask for the ancient paths, ask where the good way is, and walk in it, and you will find rest for your souls. But you said, 'We will not walk in it.'If only we would learn to walk in the "good way" and ask for the ancient paths.

Proverbs 24:11-12
Rescue those being led away to death; hold back those staggering toward slaughter.  If you say, "But we knew nothing about this," does not he who weighs the heart perceive it?  Does not he who guards your life know it?  Will he not repay each person according to what he has done?
We couldn't help but think of the Holocaust victims being led away to death or the abortion clinics, doctors, and technicians.  But also think about those people who do not know Jesus.  They are being led away toward eventual slaughter, to eternal death.  We can't plead ignorance.  We must be willing to share our faith at all times to all people.