"Nothing is stronger than habit." Ovid (43BC - 17AD)
"Curious things, habits. People themselves never knew they had them." Agatha Christie
The pot of dirt represents muscle.
The Power of Habit
You may know me. I am your constant companion. I am your greatest helper; I'm your heaviest burden. I will push you onward or drag you down to failure. I am at your command. Half the things I do you might as well turn over to me. I'm able to do them quickly, and I'm able to do them the same every time, if that's what you want.
I am easily managed; all you've got to do is be firm with me. Show me exactly how you want it done; after a few lessons I will do it automatically. I am the servant of all great men and women; of course, I'm the servant of all failures as well. I've made all the winners who have ever lived. And, I've made all the losers, too.
But I work with all the precision of a marvelous computer with the intelligence of a human being. You may run me for profit, or you may run me for ruin; it makes no difference to me.
Take me. Be easy with me, and I will destroy you. Be firm with me, I'll put the world at your feet.