Arcanā means worship of the Deity in the temple. By executing this process one confirms himself to be not the body but spirit soul. In the Tenth Canto, Eighty-first Chapter, verse 19, of Śrīmad-Bhāgavatam, it is told how Sudāmā, an intimate friend of Kṛṣṇa's, while going to the house of a brāhmaṇa, murmured to himself, "Simply by worshiping Kṛṣṇa one can easily achieve all the results of heavenly opulence, liberation, supremacy over the planetary systems of the universe, all the opulences of this material world, and the mystic power of performing the yoga system.
The events leading to Sudāmā's murmuring this statement are as follows. Śrī Kṛṣṇa had ordered His friend Sudāmā to go to a brāhmaṇa's house and ask for some food. The brāhmaṇas were performing a great sacrifice, and Śrī Kṛṣṇa told Sudāmā to plead with them that He and Balarāma were feeling hungry and needed some food. When Sudāmā went there, the brāhmaṇas refused to offer anything, but the wives of the brāhmaṇas, upon hearing that Śrī Kṛṣṇa wanted some foodstuff, immediately took many palatable dishes and went to offer them to Śrī Kṛṣṇa. In the Viṣṇu-rahasya, also, it is stated, "Any person within this world who is engaged in the worship of Viṣṇu can very easily achieve the ever-blissful kingdom of God, known as Vaikuṇṭhaloka."