I am your constant companion.

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 the things you do you might just as well turn over to me, and I will be able to do them quickly, correctly.

I am easily managed—you must merely be firm 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 people, and alas, of all failures as well.

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 human being. You may run me for profit or turn me for
ruin—it makes no difference to me.

Take me, train me, and 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!

Ref: author unknown, From S. Covey 8 Habit book