The impersonalist ceases fruitive activities out of fear, so that the resultant action may not be a stumbling block on the path of self-realization, but the personalist knows rightly his position as the eternal servitor of the Supreme Personality of Godhead. Therefore he engages himself in the activities of Kṛṣṇa consciousness. Because everything is done for Kṛṣṇa, he enjoys onlytranscendental happiness in the discharge of this service. Those who are engaged in this process are known to be without desire for personal sense gratification. The sense of eternal servitorship to Kṛṣṇa makes one immune to all sorts of reactionary elements of work.
(Bhagavad-Gita---4:18---purport).

As long as the material body exists, one has to meet the demands of the body, namely eating, sleeping, defending and mating. But a person who is in pure bhakti-yoga, or in Kṛṣṇa consciousness, does not arouse the senses while meeting the demands of the body. Rather, he accepts the bare necessities of life, making the best use of a bad bargain, and enjoys transcendental happiness in Kṛṣṇa consciousness. He is callous toward incidental occurrences—such as accidents, disease, scarcity and even the death of a most dear relative—but he is always alert to execute his duties in Kṛṣṇa consciousness, or bhakti-yoga.
(Bhagavad-Gita---6:20-23---purport).

When Śrīmatī Rādhārāṇī first saw Kṛṣṇa, She suddenly became conscious of all transcendental happiness, and the functions of Her different limbs were stunned. When Lalitā, Her constant companion, whispered into Her ear the holy name of Kṛṣṇa, Rādhārāṇī immediately opened Her eyes wide. This is an instance of alertness caused by hearing the sound of Kṛṣṇa's name.
(Nectar of Devotion).

The worker with a desire to enjoy the fruits of his work is hankering after transient material happiness, and such a worker is rewarded with worldly or heavenly happiness within the material worlds. But it must be known that all these forms of happiness are temporary. Thus, the worker cannot attain to real happiness, which is permanent and transcendental. This real and transcendental happiness is attained only after liberation from the bondage of material existence. Any action which does not aim at such transcendental happiness is always temporary and baffling.
(Message of Godhead).

Mother Devakī, being fully transcendental, sac-cid-ānanda, does not belong to this material world. Thus the Supreme Personality of Godhead appeared with four hands, as if born from her womb. Upon seeing the Lord in that Viṣṇu form, Vasudeva was struck with wonder, and in transcendental happiness he and Devakī mentally gave ten thousand cows in charity to the brāhmaṇas.
(Srimad Bhagavatam--10:3---summary).