I can't understand the role intent has to play when it comes to Karma. 

Let's just say I am giving to charity (in line with the [norms][1] laid down). But I know at the back of my mind that I am doing good karma, so I will reap benefits - maybe in this lifetime or next one. So does the fact that I am armed with this knowledge negate the act of charity? 

In my humble opinion intent should not if it were the above scenario. But then where does one draw the line ? I mean how does the expectation that I will get benefits in this life or next one any different than a quid pro quo arrangement with the said charity's chairman ? 


As always will be most helpful to get scripture references. 


  [1]: https://hinduism.stackexchange.com/questions/17318/is-it-adharma-to-give-dana-without-considering-what-we-are-giving-and-to-whom-we