People think they become free and independent through such sensual activities, but factually they become more tightly bound up in chains. The greater their accumulated wealth, the greater their anxiety and depravity. As much as they try to usurp the Supreme Lord's position of being the only enjoyer, that much and more are they drawn into the jaws of a horrible death. And these activities make a Herculean task out of such a simple and basic activity as sustaining the body, which needs a little nourishment only.
A grade higher than this mean class of gross materialists are those who believe in the transmigration of the soul. These are the fruitive workers who perform pious activities such as giving in charity, but their only motive is to ensure that their next life is one of luxury and sense enjoyment. Neither of these grades of fruitive workers realizes that both pious as well as sinful activities cause bondage. These materialists do not know that karma-yoga, activity performed without fruitive desire, is the best form of activity. Therefore they often think that the karma-yogīs are as attached to this material world as the gross materialists. The sole motive of the karma-yogī, however, is to instruct the members of society for their benefit. As Lord Kṛṣṇa, the Supreme Personality of Godhead, says in the Bhagavad-gītā (3.25) "As the ignorant perform their duties with attachment to results, the learned may similarly act, but without attachment, for the sake of leading people on the right path."