Arihanta attains: 1) Kevaijnan, perfect knowledge due to the destruction of all Jnanavariya Karmas, 2) Kevaldarshan, perfect perception due to the destruction of all Darshanavamiya karmas, 3) becomes passionless due to the destruction of all Mohniya Karmas, and 4) gains infinite power due to the destruction of all Antaraya Karmas. Complete knowledge and perception means they know and see everything everywhere that is happening now, that has happened in the past, and that will happen in the future. Arihantas are divided into two categories: Tirthankar and Ordinary. Tirthankaras are special Arihants because they revitalize the Jain Sangh (four-fold Jain Order) consisting of Sadhus, Sadavis, Shravaks (male householders), and Shravikas (female householders). During every half time cycle, twenty-four persons like us rise to the level of Tirthankar. The first Tirthankar of our time period was Lord Rushabhdev, and the twenty-fourth and last Tirthankar was Lord Mahavira, who lived from 599 B. C. to 527 B. C. A Tirthankar is also called a Jina. Jina means conqueror of passions. At the time of nirvan (liberated from the worldly existence), Arihanta sheds off the remaining four aghati karmas namely 1) Nam (physical structure forming) Karma, 2) Gotra (status forming) Karma, 3) Vedniya (pain and pleasure causing) Karma and 4) Ayushya (life span determining) Karma. These four karmas do not affect the true nature of the soul; therefore, they are called Aghati karmas. After attaining salvation these Arihants are called Siddhas.
Siddhas are the liberated souls. They are no longer among us because they have completely ended the cycle of birth and death. They have reached the ultimate highest state, salvation. They do not have any karmas, and they do not collect any new karmas. This state of true freedom is called Moksha. Siddhas are experiencing unobstructed bliss (eternal happiness). They have complete knowledge and perception and infinite power. They are formless and have no passions and therefore are free from all temptations.
The message of Jina, Lord Mahavira the last Tirthankara, is carried on by the Acharyas. They are our spiritual leaders. The responsibility of the spiritual welfare, but not social or economical welfare of the entire Jain Sangh, rests on the shoulders of the Acharyas. Before reaching this state, one has to do in-depth study and achieve mastery of the Jain scriptures (Agams). In addition to acquiring a high level of spiritual excellence, they have the ability to lead the monks and nuns. They know various languages with a sound knowledge of other philosophies and religions of the area and the world.
This title is given to those Sadhus who have acquired a special knowledge of the Agams and philosophical systems. They teach Jain scriptures to sadhus and sadhvis.