The four Śrīmad-Bhāgavatam verses beginning with aham evāsam evāgre (2.9.33–36) are the gist of the whole Bhāgavatam. These are nicely summarized by Lord Caitanya as follows: "I (Kṛṣṇa) am the supreme center for the relationships of all living entities, and knowledge of Me is the supreme knowledge. The process by which a living entity can attain Me is called abhidheya. By it, one can attain the highest perfection of life, love of Godhead. When one attains love of Godhead, his life becomes perfect." The explanation of these four verses is given in Śrīmad-Bhāgavatam, and Lord Caitanya gave a short description of the principles of these verses. He said that by mental speculation or academic education no one can understand the constitutional position of the Supreme Lord—how He is situated, His transcendental qualities, His transcendental activities and His six opulences. These can be understood only by the mercy of the Lord. As stated in the Bhagavad-gītā, one who is fortunate enough to receive the Lord's favor can understand all these explanations by the mercy of the Lord.
The Lord existed before the material creation; therefore the material ingredients, nature and the living entities all emanated from Him, and after dissolution they rest in Him. When the creation is manifest, it is maintained by Him; indeed, whatever manifestation we see is but a transformation of His external energy. When the Supreme Lord withdraws His external energy, everything enters into Him. In the first of the four verses, the word aham is given three times to stress that the Supreme Personality of Godhead is full with all opulences. Aham is stated three times just to chastise one who cannot understand or believe in the transcendental nature and form of the Supreme Lord.
The Lord possesses His internal energy, His external, marginal and relative energies, and the manifestation of the cosmic world and the living entities. The external energy is manifested by the qualitative modes (guṇas) of material nature. One who can understand the nature of the living entity in the spiritual world can actually understand vedyam, or perfect knowledge. One cannot understand the Supreme Lord simply by seeing the material energy and the conditioned soul, but when one is in perfect knowledge, he is freed from the influence of the external energy. The moon reflects the light of the sun, and without the sun the moon cannot illuminate anything. Similarly, this material cosmic manifestation is but the reflection of the spiritual world. When one is actually liberated from the spell of the external energy, he can understand the constitutional nature of the Supreme Lord. Devotional service to the Lord is the only means for attaining Him, and this devotional service can be accepted by everyone and anyone in any country and under any circumstance. Devotional service is above the four principles of religion, culminating in liberation. Actually, even the preliminary processes of devotional service are transcendental to liberation, the highest subject of ordinary religion.
Therefore, irrespective of one's caste, creed, color, country, etc., one should approach a bona fide spiritual master and hear from him everything about devotional service. The real purpose of life is to revive our dormant love of God. Indeed, that is our ultimate necessity. How that love of God can be attained is explained in Śrīmad-Bhāgavatam. There is theoretical knowledge and specific or realized knowledge, and perfect realized knowledge is attained when one realizes the teachings received from the spiritual master.