During the ceremony in which new justices take constitutional and judicial oaths, Jackson promised to “administer justice without respect to persons, and do equal right to the poor and to the rich,” according to The New York Times.

Although the investiture proceedings were “purely ceremonial” and Jackson was sworn in on on June 30, Chief Justice John Roberts Jr. said Jackson's arrival will cause the other justices to “kind of up our game a little bit.”

“It’s almost like the new in-law at Thanksgiving dinner,” he said.

Roberts added that because there will be a “new person” joining them “each of us will be a little more careful in explaining why we think what we think.”

Kagan said in remarks captured on C-SPAN that the press often refers back to former Justice Byron White's quote that whenever there is a new justice “it's a different court.” She said once doubted that but now realizes it in a sense is “deeply true.”

“It wasn’t the addition of the new justice,” she said. “It was actually the fact that the old justice was no longer there.”

Jackson is filling a seat vacated when Breyer retired.

Kagan said Breyer, who served for more than 27 years, would be difficult to replace. “He believed in the power of relationships, and he believed in the power of reason,” Kagan said.

I believe in the power of a Black mother driven by a sense of duty and dedication. In the words of President Joe Biden, who attended Jackson's investiture ceremony: “Justice Ketanji Brown Jackson has already brought uncompromising integrity, a strong moral compass, and courage to the Supreme Court.”