In the Caitanya-caritāmṛta it is stated, ekale īśvara kṛṣṇa: (CC Adi 5.142) "Kṛṣṇa is the only Supreme God." Āra saba bhṛtya: "All others are His servants." Yāre yaiche nācāya, se taiche kare nṛtya: "The Supreme Lord, as He desires, is engaging all the living entities in different activities, and thus they exhibit their different talents and tendencies." This Veda-stuti is thus the original instruction regarding the relationship existing between the living entity and the Supreme Personality of Godhead. The highest platform of realization for the living entity is the attainment of devotional life. One cannot be engaged in devotional life, or Kṛṣṇa consciousness, unless one is fully free from material contamination. Nārāyaṇa Ṛṣi informed Nārada Muni that the essence of all the Vedas and Vedic scriptures (namely, the four Vedas, the Upaniṣads, the Purāṇas and the Vedānta-sūtra) is to render transcendental loving service to the Lord. In this connection Nārāyaṇa Ṛṣi has used one particular word—rasa. In devotional service this rasa is the via medium, or the basic principle, for the exchange of dealings between the Lord and the living entity. Rasa is also described in the Vedas: raso vai saḥ. "The Supreme Lord is the reservoir of all pleasure." All the Vedic scriptures, including the Purāṇas, the Vedas, the Upaniṣads and the Vedānta-sūtra, teach the living entities how to attain the stage of rasa. The Bhāgavatam also says that the statements in the Mahā-Purāṇa (Śrīmad-Bhāgavatam) constitute the essence (rasa) of all Vedic literature. Nigama-kalpa-taror galitaṁ phalam: (SB 1.1.3) the Bhāgavatam is the essence of the ripened fruit of the tree of the Vedic literature.
We understand that with the breathing of the Supreme Personality of Godhead there issued forth the four Vedas, namely the Ṛg Veda, the Yajur Veda, the Sāma Veda and the Atharva Veda, and also the histories like the Mahābhārata and all the Purāṇas, which are considered to be the history of the world. The Vedic histories like the Purāṇas and Mahābhārata are called the fifth Veda.
The twenty-eight verses of the Veda-stuti are to be considered the essence of all Vedic knowledge. The four Kumāras and all other authorized sages know perfectly that devotional service in Kṛṣṇa consciousness is the essence of all Vedic literature, and they preach this on different planets, traveling in outer space. It is stated herein that such sages, including Nārada Muni, hardly ever travel on land; they perpetually travel in space.
Sages like Nārada and the Kumāras travel throughout the universe to educate the conditioned souls that their business in the world is not that of sense gratification but of reinstating themselves in their original position of devotional service to the Supreme Personality of Godhead. It is stated in several places that the living entities are like sparks of the fire and the Supreme Personality of Godhead is like the fire itself. If the sparks somehow or other fall out of the fire, they lose their natural illumination; thus it is ascertained that the living entities come into this material world exactly as sparks fall from a great fire. The living entity wants to imitate Kṛṣṇa and tries to lord it over material nature in order to enjoy sense gratification; thus he forgets his original position, and his illuminating power, his spiritual identity, is extinguished. However, if a living entity takes to Kṛṣṇa consciousness, he is reinstated in his original position. To preach this process of devotional service, sages and saints like Nārada and the Kumāras travel all over the universe educating people and increasing their disciples. Their aim is that all the conditioned souls may be educated to revive their original consciousness, or Kṛṣṇa consciousness, and thus gain relief from the miserable conditions of material life.