Kindness

The First Doctor thanked Joseph Longfoot for his kindness and diligence. In return for the Doctor's kindness in fixing his finger, Longfoot gave the Doctor clues to the location of Avery's treasure. (TV: The Smugglers)

The Twelfth Doctor reassured Alit that she was just being kind when she showed Bill Potts her reflection. He also told and  that he was helping the Mondasians due to it being a kind thing. (TV: The Doctor Falls)

In a speech to the Thirteenth Doctor, the Twelfth Doctor told them to be kind. (TV: Twice Upon a Time)

According to Edith Thompson, Charley Pollard was the only person who had ever been kind of her. Charley showed this, without even knowing, by simply being the only one in the household to talk to her, and remember her name. When Charley died aboard the R101, Edith was not allowed to mourn her. (AUDIO: The Chimes of Midnight)