In summary, the Bhagavad-gītā recommends that one adopt the means of devotional service, or antimaterial activities, if one wishes to enter the antimaterial world. Those who adopt the means of devotional service, as prescribed by the expert transcendentalist, are never disappointed in their attempts to enter the antimaterial world. Although the obstacles are many, the devotees of Lord Kṛṣṇa can easily overcome them by rigidly following the path outlined by the transcendental devotees. Such devotees, who are passengers progressing in the journey of life toward the antimaterial kingdom of God, are never bewildered. No one is cheated or disappointed when he adopts the guaranteed path of devotion for entrance into the antimaterial universe. One can easily attain all the results that are derived from the studies of the Vedas, performances of sacrifice, practices of penance and offerings of charities simply by the unilateral performance of devotional service, technically known as bhakti-yoga.
Bhakti-yoga is therefore the great panacea for all, and it has been made easy to practice, especially in this iron age, by Lord Kṛṣṇa Himself in His most sublime, liberal and munificent appearance as Lord Śrī Caitanya (1486-1534), who appeared in Bengal and spread the saṅkīrtana movement—singing, dancing, and chanting the names of God—throughout India. By Lord Caitanya's grace, one can quickly pick up the principles of bhakti-yoga. Thus all misgivings in the heart will disappear, the fire of material tribulation will be extinguished, and transcendental bliss will be ushered in.
In the Fifth Chapter of the Brahma-saṁhitā there is a description of the variegated planetary system that is within the material world. It is also indicated in the Bhagavad-gītā that there are variegated planetary systems in hundreds of thousands of material universes, and that altogether these universes comprise only a fraction (one fourth) of the creative energy of the Godhead. The majority (three fourths) of the Lord's creative energy is manifested in the spiritual sky, called the para-vyoma or the Vaikuṇṭhaloka. These instructions of the Brahma-saṁhitā and Bhagavad-gītā may be finally confirmed by the material scientist as he researches into the existence of the antimaterial world.