100
Śrimad-Bhāgavatam
[Canto 7, Ch. 7]
anīhāyāḥ —and from not desiring economic development;  sukha —by happiness;  āvṛtaḥ —covered.
TRANSLATION
In this material world, every materialist desires to achieve happiness and diminish his distress, and therefore he acts accordingly. Actually, however, one is happy as long as one does not endeavor for happiness; as soon as one begins his activities for happiness, his conditions of distress begin.
PURPORT
Every conditioned soul is bound by the laws of material nature, as described in  Bhagavad-gītā  ( prakṛteḥ kriyamāṇāni guṇaiḥ karmāṇi sarvaśaḥ ). Everyone has achieved a certain type of body given by material nature according to the instructions of the Supreme Personality of Godhead.
īśvaraḥ sarva-bhūtānāṁ hṛd-deśe 'rjuna tiṣṭhati bhrāmayan sarva-bhūtāni yantrārūḍhāni māyayā
“The Supreme Lord is situated in everyone’s heart, O Arjuna, and is directing the wanderings of all living entities, who are seated as on a machine, made of the material energy.” (Bg. 18.61) The Supreme Personality of Godhead, the Supersoul, is present in everyone’s heart, and as the living entity desires, the Lord gives him facilities with which to work according to his ambitions in different grades of bodies. The body is just like an instrument by which the living entity moves according to false desires for happiness and thus suffers the pangs of birth, death, old age and disease in different standards of life. Everyone begins his activities with some plan and ambition, but actually, from the beginning of one’s plan to the end, one does not derive any happiness. On the contrary, as soon as one begins acting according to his plan, his life of distress immediately begins. Therefore, one should not be ambitious to dissipate the unhappy conditions of life, for one cannot do anything about them.  Ahaṅkāra-vimūḍhātmā kartāham iti manyate.  Although one is acting