Food for thought- Who am I?

You may know me
I’m your constant companion
I’m your greatest helper
I’m your heaviest burden
I will push you onward or drag you down to failure
I am at your command
Half the tasks you do can be turned over to me
I’m able to do them quickly and
I’m able to do them the same every time
I am the servant of all great men and women
And, of course, servant of all the failure as well
I’ve made all the great individuals who have ever been great
And I’ve made all the loser, too
I work with all the precision of a computer
And the intelligent of a human being
You may run me for profit, or you may
Run me to ruin
It makes no difference to me
Make me a strong part of your life
Be easy with me and I will destroy you
Be firm with me and I’ll put the world at your feet
Who am I?
I am HABIT