Śrīla Rūpa Gosvāmī has analyzed the different sources of happiness. He has divided happiness into three categories, which are (1) happiness derived from material enjoyment, (2) happiness derived by identifying oneself with the Supreme Brahman and (3) happiness derived from Kṛṣṇa consciousness.
In the tantra-śāstra Lord Śiva speaks to his wife, Satī, in this way: "My dear wife, a person who has surrendered himself at the lotus feet of Govinda and who has thus developed pure Kṛṣṇa consciousness can be very easily awarded all the perfections desired by the impersonalists; and beyond this, he can enjoy the happiness achieved by the pure devotees."
Happiness derived from pure devotional service is the highest, because it is eternal. The happiness derived from material perfection or understanding oneself to be Brahman is inferior because it is temporary. There is no preventing one's falling down from material happiness, and there is even every chance of falling down from the spiritual happiness derived out of identifying oneself with the impersonal Brahman.
It has been seen that great Māyāvādī (impersonalist) sannyāsīs—very highly educated and almost realized souls—may sometimes take to political activities or to social welfare activities. The reason is that they actually do not derive any ultimate transcendental happiness in the impersonal understanding and therefore must come down to the material platform and take to such mundane affairs. There are many instances, especially in India, where these Māyāvādī sannyāsīs descend to the material platform again. But a person who is fully in Kṛṣṇa consciousness will never return to any sort of material platform. However alluring and attracting they may be, he always knows that no material welfare activities can compare to the spiritual activity of Kṛṣṇa consciousness.
The mystic perfections achieved by actually successful yogīs are eight in number. Aṇimā-siddhi refers to the power by which one can become so small that he can enter into a stone. Modern scientific improvements also enable us to enter into stone, because they provide for excavating so many subways, penetrating the hills, etc. So aṇimā-siddhi, the mystic perfection of trying to enter into stone, has also been achieved by material science. Similarly, all of the yoga-siddhis, or perfections, are material arts. For example, in one yoga-siddhi there is development of the power to become so light that one can float in the air or on water. That is also being performed by modern scientists. They are flying in the air, they are floating on the surface of the water, and they are traveling under the water.
After comparing all these mystic yoga-siddhis to materialistic perfections, we find that the materialistic scientists try for the same perfections. So actually there is no difference between mystic perfection and materialistic perfection. A German scholar once said that the so-called yoga perfections had already been achieved by the modern scientists, and so he was not concerned with them. He intelligently went to India to learn how he could understand his eternal relationship with the Supreme Lord by means of bhakti-yoga, devotional service.
Of course, in the categories of mystic perfection there are certain processes which the material scientists have not yet been able to develop. For instance, a mystic yogī can enter into the sun planet simply by using the rays of the sunshine. This perfection is called laghimā. Similarly, a yogī can touch the moon with his finger. Though the modern astronauts go to the moon with the help of spaceships, they undergo many difficulties, whereas a person with mystic perfection can extend his hand and touch the moon with his finger. This siddhi is called prāpti, or acquisition. With this prāpti-siddhi, not only can the perfect mystic yogī touch the moon planet, but he can extend his hand anywhere and take whatever he likes. He may be sitting thousands of miles away from a certain place, and if he likes he can take fruit from a garden there. This is prāpti-siddhi.
The modern scientists have manufactured nuclear weapons with which they can destroy an insignificant part of this planet, but by the yoga-siddhi known as īśitā one can create and destroy an entire planet simply at will. Another perfection is called vaśitā, and by this perfection one can bring anyone under his control. This is a kind of hypnotism which is almost irresistible. Sometimes it is found that a yogī who may have attained a little perfection in this vaśitā mystic power comes out among the people and speaks all sorts of nonsense, controls their minds, exploits them, takes their money and then goes away.
There is another mystic perfection, which is known as prākāmya (magic). By this prākāmya power one can achieve anything he likes. For example, one can make water enter into his eye and then again come out from within the eye. Simply by his will he can perform such wonderful activities.
The highest perfection of mystic power is called kāmāvasāyitā. This is also magic, but whereas the prākāmya power acts to create wonderful effects within the scope of nature, kāmāvasāyitā permits one to contradict nature—in other words, to do the impossible. Of course, one can derive great amounts of temporary happiness by achieving such yogic materialistic perfections.
Foolishly, people who are enamored of the glimmer of modern materialistic advancement are thinking that the Kṛṣṇa consciousness movement is for less intelligent men. "I am better off being busy with my material comforts—maintaining a nice apartment, family and sex life." These people do not know that at any moment they can be kicked out of their material situation. Due to ignorance, they do not know that real life is eternal. The temporary comforts of the body are not the goal of life, and it is due only to darkest ignorance that people become enamored of the glimmering advancement of material comforts. Śrīla Bhaktivinoda Ṭhākura has therefore said that the advancement of material knowledge renders a person more foolish, because it causes one to forget his real identity by its glimmer. This is doom for him, because this human form of life is meant for getting out of material contamination. By the advancement of material knowledge, people are becoming more and more entangled in material existence. They have no hope of being liberated from this catastrophe.