The term "Know your value (or worth") means knowing what to spend your time and energy on, and knowing yourself, respecting yourself, loving yourself enough to care for the inner you, your soul, not "selling out" your morals, your values to have something. Never compromising yourself for a friendship, for love, for money or anything else in this world. It's staying true to yourself. It's knowing that your time and talents are valuable. Work for people that appreciate them. It's knowing that love and truth are priceless, and waiting for someone who can recipricate in kind. Who puts in as much effort as you do. It's knowing that arguing with someone or trying to prove a point isnt worth the energy. Don't waste time with people who do not see or appreciate the person that you are. It's knowing what you want and sticking to it.