I am your constant companion.
I am you 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 nd correctly.
I am easily managed- you must merely be firm to 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 indviduals 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 precision of a machine plus the intelligence of a human.
You may run me for a 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 ?