Just a bunch of quotes. Amass enough quotes and you'll have one for every situation. Well, no, you'll have at least two for every situation. Then you'll realize that when it comes down to

If something feels wrong, it probably is

versus

1) Be humble

2) Shut the fuck up

the quotes don't help you figure out the difference. They don't help you figure out whether the people around you are assholes or you're just depressed. They don't help you figure out whether the customer doesn't appreciate your work or you don't appreciate that their emphasis on speed at the expense of quality actually makes business sense for them.

But once you make up your mind, you can pick a quote that makes you feel cocky about whichever way you decided to interpret the situation. So there's that.