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Śrīmad-Bhāgavatam
[Canto 4, Ch. 23]
TEXT 28
स वञ्चितो वतात्मप्रुक् कृष्णेण महता भुवि । 
    लब्धापवर्ग्यं मानुष्यं विषयेषु विषजते ॥२८॥
sa vañcito batātma-dhruk 
    kṛcchreṇa mahatā bhuvi 
    labdhvāpavargyam mānuṣyam 
    viṣayeṣu viṣajjate
saḥ—he; vañcitaḥ—cheated; bata—certainly; ātma-dhruk—envious of himself; kṛcchreṇa—with great difficulty; mahatā—by great activities; bhuvi—in this world; labdhvā—by achieving; āpavargyam—the path of liberation; mānuṣyam—in the human form of life; viṣayeṣu—in the matter of sense gratification; viṣajjate—becomes engaged.
TRANSLATION
Any person who engages himself within this material world in performing activities that necessitate great struggle, and who, after obtaining a human form of life—which is a chance to attain liberation from miseries—undertakes the difficult tasks of fruitive activities, must be considered to be cheated and envious of his own self.
PURPORT
In this material world people are engaged in different activities simply to achieve a little success in sense gratification. The  karmīs  are engaged in performing very difficult activities, and thus they open gigantic factories, build huge cities, make big scientific discoveries, etc. In other words, they are engaged in performing very costly sacrifices in order to be promoted to the higher planetary systems. Similarly,  yogīs  are engaged in achieving a similar goal by accepting the tedious practices of mystic  yoga .  Jñānīs  are engaged in philosophical speculation in order to gain release from the clutches of material nature. In these ways everyone is engaged in performing very difficult tasks simply for the gratification of the senses. All of these are considered to be engaged in sense gratificatory activities (or  viṣaya ) because they all demand some facility for material existence. Actually the results of such activities are temporary, as Kṛṣṇa Himself proclaims in  Bhagavad-gītā: antavat tu phalam teṣām : “The fruits [of those who worship the demigods] are limited and temporary.” (Bg. 7.23) Thus the fruits of the activities of the  yogīs ,  karmīs  and  jñānīs  are