This focus on stretching your ability and receiving immediate feedback provides the core of a more universal principle — one that I increasingly came… - Cal Newport

Getting to the cutting edge of a field can be understood in these terms: This process builds up rare and valuable skills and therefore builds up your store of career capital. Similarly, identifying a compelling mission once you get to the cutting edge can be seen as investing your career capital to acquire a desirable trait in your career. In other words, mission is yet another example of career capital theory in action. If you want a mission, you need to first acquire capital.

A good career mission is similar to a scientific breakthrough — it’s an innovation waiting to be discovered in the adjacent possible of your field. If you want to identify a mission for your working life, therefore, you must first get to the cutting edge — the only place where these missions become visible.

This magician’s trick of shifting the units of measure from money to time is the core novelty of what the philosopher Frédéric Gros calls Thoreau’s “new economics,” a theory that builds on the following axiom, which Thoreau establishes early in Walden: “The cost of a thing is the amount of what I will call life which is required to be exchanged for it, immediately or in the long run.