The little-known nineteenth-century French philosopher Félix Ravaisson was able to put this concept into concrete terms. He called it the double law of habit. Basically it means this: repetition strengthens our tendency to act, but it also weakens our sensation of that act. In other words, we habituate. It’s a deceptively complex process, and one that has power to sap force and meaning from our lives. We tend to keep doing things long after they have lost meaning for us. Yes, we can take advantage of that dynamic when we form new habits, as they lose their hard edges with repetition. But it’s a double-edged sword.
Habituation is one reason we lose interest in the material stuff we buy (thinking those things will finally make us happy). Certainly, you enjoyed sitting on your new couch the day it was delivered. And you got to show it off to your friends the next time they visited. But after that? You probably don’t notice it much now.
Excerpt from: Good Habits, Bad Habits: The Science of Making Positive Changes That Stick by Wendy Wood