When something is essential, it is absolutely necessary. Essential is the very definition of what’s truly important.
Urgent is relative, but essential is absolute. While urgency is usually defined by external factors, essentialness is fundamentally important to a project or goal, regardless of external factors.
Two quotes I picked up from How to Stay Focused in an Age of Distraction
There are myriad of ways to slide and dice tasks, organise projects and align goals. But if the answer to a question “is this task/project/goal essential?”, is yes then this is an important thing. This is where your focus should be. This is the thing you should dedicate your time to.