Positive or negative, it is just a 2 side of a coin..
One bring happiness and the latter bring sorrow..

Deeper meaning, I am as i am today because of my past programming... Im happy today, because i have continuously absorb positivism all this while from previous days, months and years... same on latter, continuous absorbing negativity on previous days, months and years would make me a sorrow person... it is the power of attraction that submerge what we are today and what we would be tomorrow...

And yes as what u said practice... the only way that can change everything... practice with determination and endurance and in period it would be materialize.. very warm touching post.. thanks and God Bless..