Among Pablo's core beliefs is the value of courage. He does not want Juan, Tom, or the doctor to see him looking fearful about being shot the morning after they are all sentenced to death. When the doctor looks at Pablo, he returns his gaze steadily, showing no fear. Pablo is put off by Juan's abject terror and Tom's way of coping with his own fear.
Pablo believes in freeing Spain. He has aligned himself with Ramon Gris and will not give up his location to his Falangist captors even when they offer to spare his life in return for the information. Pablo also finds the officiousness of his captors disgusting and finds amusement in sending them to the cemetery to find Ramon Gris, as he believes that it will be a wasted trip.
To Pablo, courage and dedication to a cause are well-founded values, and he does not waver from either of them.