The term quantity is from the early 14c., quantite, "amount, magnitude, the being so much in measure or extent," from Old French quantite, cantite (12c., Modern French quantité) and directly from Latin quantitatem (nominative quantitas) "relative greatness or extent," coined as a loan-translation of Greek posotes (from posos "how great? how much?") from Latin quantus "of what size? how much? how great? what amount?"
How much is enough? How much revenue growth do you need? Quantity of sales, volume, and all other items to count are important. The most important item is the quantity needed to satisfy you. Excess is everywhere. Give. Take only when necessary.
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Unfathomable, misunderstand the journey, arise from the ash