When I started flossing before bed, it was difficult to floss every single night. Having done it for several years now, it is difficult not to.
When I started writing this blog, it was difficult to sit down and write every single day. Having written 800+ posts, it is difficult not to.
Like Newton’s first law, our behaviour tends to stay either in a state of rest or uniform motion. Habituating hard things works like a flywheel. Once we have gotten things rolling, it helps us sustain momentum.