If you focus too much on the past, it brings out emotions of unforgiveness, anger, and resentment. If you focus too much on the future, you attract emotions of fear and anxiety; a lot of what if questions.

Well what are you supposed to focus on? The now, obviously. If you continually focus on the past and future, it's like a hamster running on a treadmill; one's already happened, and the other has yet to happen. Both in reality, which are out of your own control, are the causes of negative emotion, self-talk and any other ego-stroking emotions.