There are different kinds of men, beginning with the brāhmaṇa and going down to the lowest platform, known as caṇḍāla. Whatever one’s position, everyone in this Age of Kali needs to be enlightened in Kṛṣṇa consciousness. That is the greatest need of the day.
(Sri Caitanya Caritamrta----2:15:41----purport).

That the boys do not have the kṣatriya spirit does not mean that they are trained in brahminical qualities; they are trained as śūdras, and thus in frustration they are becoming hippies. However, as soon as they enter the Kṛṣṇa consciousness movement being started in America, they are trained to meet the brahminical qualifications, even though they have fallen to the lowest conditions as śūdras. In other words, since the Kṛṣṇa consciousness movement is open for everyone, people in general can attain the brahminical qualifications. This is the greatest need at the present moment, for now there are actually no brāhmaṇas or kṣatriyas but only some vaiśyas and, for the most part, śūdras. The classification of society into brāhmaṇas, kṣatriyas, vaiśyas and śūdras is very scientific. In the human social body, the brāhmaṇas are considered the head, the kṣatriyas are the arms, the vaiśyas are the belly, and the śūdras are the legs. At the present moment the body has legs and a belly, but there are no arms or head, and therefore society is topsy-turvy. It is necessary to reestablish the brahminical qualifications in order to raise the fallen human society to the highest standard of spiritual consciousness.
(Srimad Bhagavatam----4:8:36----purport).

Śyāmasundara: He says that the greatest good is the elimination of the greatest evil or the fulfillment of man's greatest needs.
Prabhupāda: That's it. We follow that, that the highest objective, the ultimate objective is Kṛṣṇa, Viṣṇu. So becoming a Vaiṣṇava, the highest perfection of human life is achieved.
Śyāmasundara: So that greatest need is...
Prabhupāda: Kṛṣṇa consciousness. The greatest need is Kṛṣṇa consciousness. (Hindi with guest) Kṛṣṇa consciousness, that is the supreme consciousness. Yes. That is pure consciousness, Kṛṣṇa. Mamaivāṁśo jīva loke jīva-bhūtaḥ sanātanaḥ [Bg. 15.7]. Every living entity is Kṛṣṇa's part and parcel. He always remembers that "I am part and parcel of Kṛṣṇa. It is my duty to serve Kṛṣṇa." This is Kṛṣṇa consciousness.
(Philosophy Discussion).