It’s raining today. Let me not work today and enjoy instead.
Or it’s a festival today. Let’s skip the workout.
It’s too cold today. I’d rather not get to the desk and write.

These are words of an amateur. 

However, a professional shows up to work daily.
Consistently.
Relentlessly.
Even when they don’t feel like it.
They don’t do it for the accolades, they do it for who they become in the process of showing up daily.

The differences between an amateur and a pro aren’t on the basis of their skills or talents.
The pro is the amateur that simply showed up every day.