आपूर्यमाणमचलप्रतिष्ठं समुद्रमापः प्रविशन्ति यद्वत्। तद्वत्कामा यं प्रविशन्ति सर्वे स शान्तिमाप्नोति न कामकामी॥
He attains peace into whom desires flow as rivers into the ocean, which, though brimming with water, remains ever the same; not he whom desires carry away.
Simple meaning
Krishna compares a wise person to the ocean: rivers keep pouring in, yet the ocean stays calm and full. Peace comes to the one who isn't carried away by every desire, not to one who chases each one.
In real life
Someone who used to buy every new phone learns to enjoy what they have. New launches still come, but they no longer disturb him.
A young professional stops comparing her salary with friends on LinkedIn and finds she's actually content with her growth.
Try this today: Next time you feel a strong urge to buy or compare, wait 48 hours. Notice how much the urge fades.

