Let's explore the expression "time and effort" as in "I have put so much time and effort into doing this."

As most of us are well aware of, time is the scarcest resource we have in this life.

But what is effort?

Effort is the energy you can project at a particular point in time.

As you grow older you can project less and less energy into the production of value for others or yourself. That is, the amount of energy you can project monotonically decreases as a function of time.

As a derivative of time, thus, effort/energy is the second scarcest resource you have.

Be kind with your future self (and your heirs) and store that time and energy into something that can hold their spent value forever.

Don't let time thieves steal the most precious resources you have.