I take it as being that revenge is a two edged sword...you may be cut with it as well. When you go after someone for revenge, you might not survive. Your act can bring you down as well. Is it worth it?

People are going to do what they do. We cannot control the actions of others. Since this is beyond our control, we should look to what it is that we can control. We can control our own actions and behavior.

simply saying that to travel the road of revenge. you will dig your own grave.
you will lower yourself to the point that you will not like the person that you will become and you might as well dig your own grave so you can put yourself in after you screw thing up so much that you will want to be dead.
not very poetic but i am sure on of our great philosophers will do
this the Justice that it deserves.

When you embark for strange journey, don't leave any of yourself vengence safely on shore.

It goes along with what is said by our creator who know what is best for us.
Romans 12:21 Do not let yourself be conquered by the evil but conquer evil with the good.
Romans 12:17 Return evil for evil to no one
Prov 25:21,22 If the one who hates you is hungry give him bread to eat...
For coals are what you are raking together upon his head.
In the figure of speech draw from the method of smelting metals in Bible times you may melt the enemy hardness by kind deeds.
There are no good on the consequences of evil but if we slow our angry we are better than a might man (Prov 16:32)
Vengence is mine said God Deut 32:35 ,so we do not want to take from God what belongs to him and he can do a better job .
We gain respect of others when we demonstrate fine qualities but also we built inner strengh .
Prov 14:30 A calm heart is the life of the fleshly organism...
So it means our health but we can die by taking revenge.

getting someone back that has done wrong to you

Because when you hurt someone, you are hurting yourself!