I work with two completely opposite foundations when I teach.
On the one hand I work hard to encourage students to paint more often. I use specific strategies to help them grow their art. Concepts clearly explained and then built upon that I know from experience will impact their painting skills. And - painting more means faster learning too!
Opposing this? I want students to understand that all art courses with me are a guilt free zone. Simply put: sometimes life gets in the way of art. I don't need to know that Aunt Bertha came unexpectedly for a few days. Make some good notes from the lesson and if you don't get a chance to do that week's assignment, your art will be waiting for you later.
In the end, I hope that you are motivated not by guilt, but by the joy of the creative calling. If that is inside you, even if there are times away from art long or short, your creative spirit will surely find the right time to shine again.