They stared at her curiously, and she caught snatches of conversation in two or three languages. It wasn't hard to guess their content, and she smiled a bit primly. Youth, it appeared, was full of illusions as to how much sexual energy two people might have to spare while hiking forty or so kilometers a day, concussed, stunned, diseased, on poor food and little sleep, alternating caring for a wounded man with avoiding becoming dinner for every carnivore within range - and with a coup to plan for the end.
Lois McMaster BujoldThis is the most important thing I will ever say to you. The human mind is the ultimate testing device. You can take all the notes you want on the technical data, anything you forget you can look up again, but this must be engraved on your hearts in letters of fire. There is nothing, nothing, nothing, more important to me in the men and women I train than their absolute personal integrity. Whether you function as welders or inspectors, the laws of physics are implacable lie detectors. You may fool men. You will never fool metal. Thatโs all.
Lois McMaster Bujold