(Lawrence) "I killed two people. One was...yesterday? He was just a boy and I led him into quicksand. The other was... well, before Agaba. I had to execute him with my pistol, and there was something about it I didn't like."
(Allenby) "That's to be expected."
(Lawrence) "No, something else."
(Allenby) "Well, the , let it be a lesson."
(Lawrence) "No...something else."
(Allenby) "What, then?"
(Lawrence) "I enjoyed it."
This is the first time that Lawrence learns that he enjoys killing people. He was previously unaware of this aspect of his character and it is something that troubles him enormously, not only because he knows this is not a reaction that is considered normal, but also because it is directly opposed to the view he had of himself. Lawrence considers himself a man of mercy, not a psychopath, and the knowledge is almost more traumatizing to him than the act of killing itself. Discovering he has a psychopathic part of himself has a detrimental affect on Lawrence and it this rather than the actual experiences that he had that changed him and caused him to become despondent and traumatized.
So long as the Arabs fight tribe against tribe, so long will they be a little people, a silly people - greedy, barbarous and cruel, as you are."
This is actually an astute observation about the Arabs as the disarray Lawrence witnesses is entirely due to old tribal differences and grudges that remain unforgiving for hundreds of years. For example, Gasim is killed because he attacks one of Auda's men over a blood feud. The Arabs are unable to rule their own city because they cannot work together without bickering over tribal disagreements which means that they have to be governed by the British instead of being able to govern themselves. Lawrence's point is that whilst they cannot put hear tribal differences aside they will never be a country but will stay a collection of tribes incapable of self government.
(Mr Dryden) "Lawrence, only two kinds of creature get fun in the desert. Bedouins and gods, and you're neither. Take it from me,for ordinary men, it's a burning, fiery furnace. "
(Lawrence) "No, Dryden, it's going to be fun."
This is a telling conversation because it reveals two important facts about Lawrence's personality. The first thing it shows is that he was very contrary. Whereas most people hate the desert, he claims that that he will enjoy it. This is either because he genuinely does thrive on experiences the average joe would hate, or it could also be that he wants to give this Impression to his superiors. He was always keen to make himself stand out as different. The other revealing thing about this conversation is that it alludes to Lawrence's own belief in his godlike status. Clearly he does not think of himself as a Bedouin but he does think of himself as some kind of god, and the knowledge that only gods cope with he desert well makes him assume that in that case he will not only deal with it, but enjoy it as well, thereby proving that he is more than human.
