The First Doctor noted that, by travelling through space time within the TARDIS, a crew could meet up with countless adventures. (COMIC: The Secrets of the Tardis)
When Clara Oswald asked the Twelfth Doctor if they would ever get a break from their adventures, he first compared adventures to buses, then explained that adventure was just life without the boring bits. (COMIC: Epilogopolis)
When the Twelfth Doctor asked Missy if she'd had any experience with the Monks, the Time Lady noted that she'd had adventures that didn't revolve around the Doctor. (TV: The Lie of the Land)
Early on in his life, the Fifteenth Doctor reflected on the new adventures he would have. (PROSE: "Heroes of Time" [+]Part of Whotopia: The Ultimate Guide to the Whoniverse, Simon Guerrier, Una McCormack and Jonathan Morris, BBC Books (2023).) Later, when he parted ways with his companion Ruby Sunday, leaving her to get know her biological parents, he told her that her adventure was just beginning. (TV: Empire of Death [+]Russell T Davies, Doctor Who series 14 (BBC One and Disney+, 2024).)