I am your greatest helper or heaviest burden.
I will push you onward or drag you down to failure.
I am completely at your command.
Half of the things you do 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 firm with me.
Show me exactly how you want something done and after a few lesson 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 place the world at your feet. Be easy with me and I will destroy you.
Who am I?
I am habit!