Habits - Good or Bad

In Dave Ramsey's book, Financial Peace inwhich he states that the author is unknown.

Here it is:I am your constant companion, I am your greatest helper or yourheaviest burden, I will push you onward or drag you down to failure. I am at your command. Half of the tasks that you do you might justas well turn over to me and I will do them quickly and correctly.

I am easily managed, you must merely be firm with me. Show meexactly how you want something done; after a few lessons I will do itautomatically. I am the servant of all great people and alas of allfailures as well. Those who are great I have made great, those whoare failures I have made failures.

I am not a machine, but I work with all the precision of a machine,plus the intelligence of a person. Now you may run me for profit oryou may run me for ruin. It makes no difference to me. Take me,train me, be firm with me, and I will lay the world at your feet. Beeasy with me and I will destroy you.

Who am I? I am called Habit.