1. "I know that members of this committee have frequently framed these complicated issues in the form of a simple question: Was there a 'quid pro quo'? With regard to the requested White House call and White House meeting, the answer is yes."
2. "We followed the president's orders."
"Secretary Perry, Ambassador Volker and I worked with Mr. Rudy Giuliani on Ukraine matters at the express direction of the president of the United States. We did not want to work with Mr. Giuliani. Simply put, we were playing the hand we were dealt."
3. "Everyone was in the loop. It was no secret" — on how Pence, Pompeo, Bolton and others were aware of his efforts in Ukraine.
4. "That's how the president and I communicate, a lot of four-letter words. In this case, three letter." — recalling telling Trump that Zelenskiy "loves your ass," Sondland said that sounded like something he would say.
5. "I know exactly what it means ... I didn't know at the time." — that investigating Burisma also meant probing the Biden family.
6. "He didn't actually have to do them, as I understood it." — on whether Zelenskiy needed to follow through on carrying out the investigations into the Bidens and the 2016 election after publicly announcing them.