One verse

Srimad Bhagavatam 4.23.7

4.23.7

तितिक्षुर्यतवाग्दान्त ऊर्ध्वरेता जितानिल: । आरिराधयिषु: कृष्णमचरत्तप उत्तमम् ॥ ७ ॥

titiksur yata-vag danta urdhva-reta jitanilah ariradhayisuh krsnam acarat tapa uttamam

titiksuh
tolerating
yata
controlling
vak
words
dantah
controlling the senses
urdhva-retah
without discharge of semen
jita-anilah
controlling the life air
ariradhayisuh
simply desiring
krsnam
Lord Krsna
acarat
practice
tapah
austerities
uttamam
the best.

Maharaja Prthu underwent all these severe austerities in order to control his words and his senses, to refrain from discharging his semen and to control the life air within his body. All this he did for the satisfaction of Krsna. He had no other purpose.