Karma

I don't believe in Karma.

... at least not in the sense of the word that is often used in Western society. That direct cause and effect that if you do something evil/bad that something bad will happen to you... or that if you do good in the world, your life will be good. In addition, I find that this sort of thinking is very individualistic and can lead to selfish thinking because basically the motive behind doing something good is carried with personal gain rather than wanting to benefit the collective, regardless of what will happen to you...

That's not to say that i dont believe in positivity spreading positivity (and negativity spreading negativity). Though I believe this on a grander scale. It is possible that the good deeds you do will eventually come back, but in my beliefs you may never see it in your lifetime because acts of kindness (or other types of energies) create a ripple effect that sort of flows along a continuum and get dispersed among everything living...

I feel it could do more for the world to think more collectively and decide to do good things because it would benefit every living thing on a whole without wondering how it will benefit ourself individually...

On another note, i dont believe in jinxes, needing to knock on wood for anything, nor do i feel we need to say "bless you" when someone sneezes... however sometimes i'll say 'bless you' as a form of courtesy/politeness since other people seem to think it's rude if it's not said.
Jinxes & knocking on wood: I dont believe that just the act of saying something about what you want or don't want to happen will affect the likelyhood of it happening.
Bless you: I dont think that people are being invaded by evil spirits when they sneeze and need to be blessed by me (of all people) in order to rid of this. I dont believe that saying bless you would even remotely save you from getting the black plague if that was a current risk.