There are Seven Rays or Sacred Flames which begin your journey to Ascension. The Fourth Ray is smack-dab in the middle. You may work with any of the Rays at any time, just know there are three Rays, or experiences of learning, before the Fourth.
With the Fourth Ray you are committing yourself to standing within the Ascension Flame and allowing imperfections to be burned away from you. Be in an attitude of allowing and gratitude and you will experience greater peace and more freedom than you knew was possible.