All people operate from the same two motivations: to fulfil their desires and to escape their suffering.

Learning this allowed me to finally make sense of how people can hurt each other so badly. The best explanation I had before this was that some people are just bad. What a cop-out. No matter what kind of behaviour other people exhibit, they are acting in the most effective way they are capable of (at that moment) to fulfill a desire or to relieve their suffering. These are motives we can all understand; we only vary in method, and the methods each of us has at our disposal depend on our upbringing and our experiences in life, as well as our state of consciousness. Some methods are skilful and helpful to others, others are unskilful and destructive, and almost all destructive behaviour is unconscious. So there is no good and evil, only smart and dumb (or wise and foolish.) Understanding this completely shook my long-held notions of morality and justice.

One of the ways that we act to end our suffering also ends everything else. Suicide. 
A way we act to get what we want, take it, with out permission.
Steal it.
Both ways ruin relationships.
Both also they both involve lying.
To steal we have to lie about stealing it and also we most likely have to lie to get into the situation in the first place.
For suicide, we lie to the people around us insted of telling them how we feel.
We attempt and succed in lying to them in the ultimit way by acting nice and happy, when in reality we are falling appart inside.