Every kṛṣṇa-bhakta, Kṛṣṇa conscious person, is mahātmā, real mahātmā. How it is? Kṛṣṇa says, mahātmānas tu māṁ pārtha daivīṁ prakṛtim āśritāḥ, bhajanty ananya-manasaḥ (BG 9.13). That is mahātmā. Mahātmā does not mean that if you dress yourself with a certain colored cloth and have some big hairs and beards, then you become mahātmā, no. The mahātmā is he... Who? Daivīṁ prakṛtim āśritāḥ: "He is not under the influence of this external energy." Daivī-prakṛti means... There are two prakṛtis, two natures: internal and external. Internal energy is spiritual energy, and external energy is material energy. So mahātmās, they are not under material energy.
Daivi-prakrti means
Lectures
Srimad-Bhagavatam Lectures
Daivīṁ prakṛtim āśritāḥ: "He is not under the influence of this external energy." Daivī-prakṛti means... There are two prakṛtis, two natures: internal and external. Internal energy is spiritual energy, and external energy is material energy. So mahātmās, they are not under material energy.
Lecture on SB 1.5.28 -- Vrndavana, August 9, 1974: