Life is not an easy matter... You cannot live through it without falling into frustration and cynicism unless you have before you a great idea which raises you above personal misery above weakness above all kinds of perfidy and baseness.
Courtesy is a silver lining around the dark clouds of civilization it is the best part of refinement and in many ways an art of heroic beauty in the vast gallery of man's cruelty and baseness.
If you're doing an interview you need conversational tension. After you talk to them you're not going to have a relationship with them they're not going to like you they're not going to be your friend.