Hello can someone help me with this?english is not my first language so im having a hard time judging this speech soundness of the author's reasoning

1)what are the evidences (data, statistics, research)used by the speaker to prove her point?

2)what are the examples and opinions used by the speaker to prove her point?

(the speech is in the picture)​

"the tune the he might never know again." this part build anticipation. dexter got extremely happy by the piano tune. he could see what he was living at that moment in his life throught this feeling. the reader might want to learn more about his happy life. in fact, he called it a state of   'ecstasy'. the fact that he had got in a mood of intense appreciation and that everything about him was extremely bright and glamorous might lead the reader to feel that this state of happiness may not last long. the two parts from the excerpt that exemplify the anticipation are: " the sound of the "; " it was a know again."