Laziness

It is easy to take a day off of our practice, whatever the practice may be. Our schedule may be busy, we may be tired, we may be stressed. We decide to skip a day, or two, or three. We are smart, mind-driven creatures who can easily come up with rationalizations for whatever we like. 

But we are not staying the course. We are not committed. All these rationalizations are laziness, pure and simple. 

It was put well in How Yoga Works by Roach and McNally:
"They are just plain laziness; laziness, don't call it anything more noble. Something else comes up, and the yoga takes a little effort, and time, and so you skip it. You don't really want to do it."

We can rationalize all we want, but we are just being lazy. We must decide what is important to us - how much do we want to progress in our physical or spiritual yoga practice (or any other practice)? If our practice is important, we must prove it by actually practicing regularly and not making excuses for our laziness.