brains + heart = thoughts?

Hm, been thinking and pondering for the past week on certain stuffs.....

Anywae... been wondering on the following... when making decisions, which equation do u follow?

1) Brains = thoughts = actions

2) Heart = thoughts = actions

3) Brains + Heart = thoughs = actions

Some ppl tell ya to follow ur heart... others, ur brain... now which is which? i think its the 3rd option, but that leads me to to an all new confusing state of my mind coz i can't seem to make up my mind... grr... irritating... do i think a lot? hm... questions to ponder.....

I'm searching for answers... i need answers.... need to see the light of my life...