"I just can't believe all the things I did that decade"

In this quote, Dick Schaap expresses shock and maybe even be sorry for over his actions during a specific decade of his life. Making use of the word "simply" recommends that the speaker is still processing and coming to terms with their past actions. The phrase "all the things I did" implies that there were numerous actions taken throughout this time period, and the speaker might be overwhelmed by the magnitude of their options. This quote might also mean a sense of fond memories or longing for an easier time, as the speaker reflects on their past actions. Overall, this quote conveys a sense of introspection and reflection on one's past experiences.