Quiet moments bring you closer to God. It's your silent time within your own private sanctuary. People have so many things to talk about, worry about, think about, without giving themselves peace within. Quiet moments give you access to areas of your brain which allows you to function proficiently.
Knowledge of Self is very important, you can't be living in a world pretending to be someone you're not. No one will ever believe in you, when you don't have the courage to believe in yourself. You can not live to impress others solely not giving thought to express your true being. No one wants to interact with a pretender, a fake, a wannabe.