who am i?

I can make you rise or fall. I can work for you or against you. I can make you a sucess or failure.
I control the way that you feel and the way that you act.
I can make you laugh..work...love. I can make your heart sing with joy...achievement...elation.. Or I can make you wretched..dejected..morbid
I can mke you sick...listless...I can be as a shackle... heavy...attached..burdesome...lost forever unless captured by pen or purpose.
I can be nurtured and grown to be a great and beautiful...seen by the eyes of others through action in you.
I can never be removed..only replaced.
Who am I?