I am your constant companion.  I am your greatest helper or your heaviest burden.  I will push you onward or drag you down to failure.  I am completely at your command.

Half the things you do, you might just as well turn over to me, and I will be able to do them quickly and correctly.  I am easily managed; you must merely be form with me.  Show me exactly how you want something done, and after a few lessons I will do it automatically.

I am the servant of all great men and, alas, of all failures as well.  Those who are great, I have made great.  Those who are failures, I have made failures.

I am not a machine, though I work with all the precision of a machine.  Plus the intelligence of a man.  You may run me for profit, or run me for ruin.  It makes no difference to me.

Take me, train me, be firm with me and I will put the world at your feet.  Be easy with me and I will destroy you.

Who am I?

I am HABIT

(author unknown)