In displaying the psychology of your characters, minute particulars are essential. God save us from vague generalizations! Be sure not to discuss your hero's state of mind. Make it clear from his actions. Nor is it necessary to portray many main characters. Let two people be the center of gravity in your story: he and she.
Anton ChekhovWhat truth? You see where truth is, and where untruth is, but I seem to have lost my sight and see nothing. You boldly settle all important questions, but tell me, dear, isn't it because you're young, because you haven't had time to suffer till you settled a single one of your questions? You boldly look forward, isn't it because you cannot foresee or expect anything terrible, because so far life has been hidden from your young eyes? You are bolder, more honest, deeper than we are, but think only, be just a little magnanimous, and have mercy on me.
Anton Chekhov