insatiable thirst
Synonyms
Examples
The insatiable thirst for everything which lies beyond, and which life reveals, is the most living proof of our immortality.
Everything Mengistu has done since 1977 has been to place himself in a position of uncontestable power. Neither Haile Selassie nor any of the previous emperors had this insatiable thirst for power.
Your curiosity is your greatest gift. Use it to expand your scope. Ordinary people won't understand your insatiable thirst for excellence. They won't bother to keep striving because it's too onerous, too difficult.