It is kind to give your friend a present.
James is writing some notes in class and also has a backpack full of pens, when his friend Todd asks to borrow a pen.
James wants to answer Todd.
James tells Todd that he can have a pen, and he can keep it since James has so many.
James tells Todd that he cannot lend him a pen because he only has one and it's his, Todd should buy his own.
Todd is delighted that he will have something to write with and that James is so generous as to let him keep it after.
Todd is stressed out because he needs a pen and thinks James is a selfish person.