In the beginning, if you work too hard, you’ll sputter out when it counts.
There is a tight balance between overworking yourself and operating at the level you need to be at to be effective.
We spend most of our careers trying to understand and find that perfect nirvana of optimization between working smart and working hard.
We all know our internal limits, and the eternal goal is to find that balance so you don’t sputter out when you need it the most.