One verse

Srimad Bhagavatam 7.7.42

7.7.42

सुखाय दु:खमोक्षाय सङ्कल्प इह कर्मिण: । सदाप्नोतीहया दु:खमनीहाया: सुखावृत: ॥ ४२ ॥

sukhaya duhkha-moksaya sankalpa iha karminah sadapnotihaya duhkham anihayah sukhavrtah

sukhaya
for achieving happiness by a so-called higher standard of life
duhkha-moksaya
for becoming free from misery
sankalpah
the determination
iha
in this world
karminah
of the living entity trying for economic development
sada
always
apnoti
achieves
ihaya
by activity or ambition
duhkham
only unhappiness
anihayah
and from not desiring economic development
sukha
by happiness
avrtah
covered

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.