What is Nibbana?

The destruction of geed and lust (Lobha)
The destruction of ill will and hatred (Dosa)
The destruction of delusion and ignorance
That, friend, is called (Moha)
Nibbana
From greed arises grief
From greed arises fear
For him who is free of greed
There is no grief
Much less fear
(- Dhammapada 215)

By oneself is evil done
By oneself is one defiled
By oneself is evil avoided
By oneself is one purified
Purity and impurity depend on oneself
No one can purify another