When My servants question thee concerning Me, then surely I am nigh. I answer the prayer of the suppliant when he crieth - Quraan 2:186 (2)

"Our Lord! Give unto us in the world that which is good and in the Hereafter that which is good, and guard us from the doom of Fire." Quraan 2:201

رَبَّنَا آتِنَا فِي الدُّنْيَا حَسَنَةً وَفِي الآخِرَةِ حَسَنَةً وَقِنَا عَذَابَ النَّارِ
البقرة : ٢٠١

Asking Allah for a good life and good afterlife. That's how we should live our lives by focusing on both not neglecting one and put all our focus on the other, enjoying this temporarily life but also not to forget why we are here in the first place, that there will be another eternal life.

There's a well known phrase attributed to Ali Ibn Abu Talib but apparently it was said by his son Hassan Ibn Ali:
"Build this life as if you were to live forever, prepare for the Hereafter as if you were to die tomorrow"

إعمل لدنياك كأنك تعيش أبداً، وأعمل لآخرتك كأنك تموت غداً
من موعظة الحسن بن علي لجنادة بن أبي أمية

There's a similar phrase attributed to Mahatma Gandhi using the same model but with different objectives:
“Live as if you were to die tomorrow. Learn as if you were to live forever.”