Excerpt from the dharma talk.

The heaviest burdens we can carry are the burdens of the past- either for something that was done to us or done by us, and we spend so much time there.   I have talked about this before, that we are constantly time-traveling from the past to the future and rarely present in the flow of now.  We fix ourselves firmly in the past or because our dissatisfaction with the present or our unwillingness to change in the present, we travel constantly to the future, where everything is controllable, and the outcomes can be as expected. As Gyomay Kubose Sensei teaches, 

"Many people get attached to the past or to the future and neglect the important present. We must live the best "now" with full responsibility." 

I think we understand this though many of us do nothing about it. I think that is why Gyomay Sensei ends his teaching with the idea of living with full responsibility.