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Śrīmad-Bhāgavatam
[Canto 10, Ch. 1]
thou art, and unto dust shalt thou return.” But when the body again mixes with the five material elements—earth, water, fire, air and ether—the mind continues to work. The mind is the subtle substance in which the body is created, as we actually experience in our dreams and also when we are awake in contemplation. One must understand that the process of mental speculation develops a new type of body that does not actually exist. If one can understand the nature of the mind ( manorathena ) and its thinking, feeling and willing, one can very easily understand how from the mind different types of bodies develop.
The Kṛṣṇa consciousness movement, therefore, offers a process of transcendental activities wherein the mind is fully absorbed in affairs pertaining to Kṛṣṇa. The presence of the soul is perceived by consciousness, and one must purify his consciousness from material to spiritual, or, in other words, to Kṛṣṇa consciousness. That which is spiritual is eternal, and that which is material is temporary. Without Kṛṣṇa consciousness, one’s consciousness is always absorbed in temporary things. For everyone, therefore, Kṛṣṇa recommends in  Bhagavad-gītā  (9.34),  man-manā bhava mad-bhakto mad-yājī māṁ namaskuru . One should always be absorbed in thought of Kṛṣṇa, one should become His devotee, one should always engage in His service and worship Him as the supreme great, and one should always offer Him obeisances. In the material world one is always a servant of a greater person, and in the spiritual world our constitutional position is to serve the Supreme, the greatest,  paraṁ brahma . This is the instruction of Śrī Caitanya Mahāprabhu.  Jīvera ‘svarūpa’ haya—kṛṣṇera ‘nitya-dāsa’  (Cc. Madhya 20.108).
To act in Kṛṣṇa consciousness is the perfection of life and the highest perfection of  yoga . As Lord Kṛṣṇa says in  Bhagavad-gītā  (6.47):
yoginām api sarveṣāṁ mad-gatenāntarātmanā śraddhāvān bhajate yo māṁ sa me yuktatamo mataḥ
“Of all  yogīs , he who always abides in Me with great faith, worshiping Me in transcendental loving service, is most intimately united with Me in  yoga  and is the highest of all.”
The condition of the mind, which flickers between  saṅkalpa  and