Macbeth

6. . Sometimes you have to do things other people consider wrong to get ahead.

I agree with this occasionally but sometimes not. In the case of Macbeth i would disagree. I don not think killing someone just to be king would be okay to do to get ahead. Especially when he is already thane of two places. However if it was a very little thing it might be okay. 

2.  If you are in a position of power, you are happy.

I think for the most part this is a correct statement. However this is not true in all situations. Someone can have everything and still not be happy.