Very well explained: http://www.youtube.com/watch?v=deC_ROdaJFE&feature=related
Personality – A form of Rigidity. Fixed likes/dislikes/opinions/aspirations etc.
Its just a creation that helps you push your way through physical world. If you want to ascend to higher dimensions, it is necessary to dissolve this personality. Like a burnt clay pot vs a mud pot. The mud pot completely dissolves when put into water while the burnt clay pot continues to remain rigid.
I’ve seen most spiritual practices expose you to this truth and lead you towards dissolving the personality. That is why they are so shocking at first. For e,g.: When I went for the vipassana retreat, I could feel my personality dissolving and I have to admit it was really scary and each time I would compulsively start internal verbal dialogue and bring it back.