ये हि संस्पर्शजा भोगा दुःखयोनय एव ते। आद्यन्तवन्तः कौन्तेय न तेषु रमते बुधः ॥

ye hi sansparśha-jā bhogā duḥkha-yonaya eva te ādyantavantaḥ kaunteya na teṣhu ramate budhaḥ

The delights that are contact-born, they are verily wombs of pain, for they have beginning and ending, O Kaunteya; not in them may rejoice the wise.

In plain words: Krishna tells Arjuna (called Kaunteya, son of Kunti) that pleasures from the senses lead to pain. They start and they end, so a wise person does not build happiness on them.