It's good to sharpen your craft
John is a programmer and recently comes across a course for a programming language he is unfamiliar with.
John wants to consider signing up for the course.
John signs up for the programming course and sets aside time for the course.
John decides the programming course is not worth his time and does not sign up for it.
John improves his programming skills and maintains relevancy in the programming world.
John's programming skills stagnate as programming itself continues to change and improve.