One verse

Srimad Bhagavatam 8.19.24

8.19.24

यद‍ृच्छयोपपन्नेन सन्तुष्टो वर्तते सुखम् । नासन्तुष्टस्त्रिभिर्लोकैरजितात्मोपसादितै: ॥ २४ ॥

yadrcchayopapannena santusto vartate sukham nasantustas tribhir lokair ajitatmopasaditaih

yadrcchaya
as offered by the supreme authority according to one’s karma
upapannena
by whatever is obtained
santustah
one should be satisfied
vartate
there is
sukham
happiness
na
not
asantustah
one who is dissatisfied
tribhih lokaih
even by possessing the three worlds
ajita-atma
one who cannot control his senses
upasaditaih
even though obtained.

One should be satisfied with whatever he achieves by his previous destiny, for discontent can never bring happiness. A person who is not self-controlled will not be happy even with possessing the three worlds.