In the Samyuktagama Sutra, it is said:
When desire is exhausted, anger is exhausted, delusion is ex- hausted, and all afflictions are exhausted — this is called nirvana.
What is nirvana? Liberation is nirvana. From the standpoint of Mahayana Buddhism, the three bodies of an enlightened being – dharmakaya, sambhogakaya, nirmanakaya – and the five wisdoms are called nirvana.
What does true peace mean? After liberation, there is genuine freedom from the three types of suffering mentioned before; the seeds of the three types of suffering and their designations also cease to be. This pure and everlasting happiness is true peace. It is not the happiness ordinary people refer to; rather, happiness is just freedom from suffering that arises from contaminated actions. Because it is pure, it is deemed “true peace.”
We shall not elaborate further on nirvan here.