All qualia (which consciousness itself closes over) are impossible to rigorously define with words. Attempts to do so will come across as woo.
What we can do however is experience qualia first-hand, and prove to ourselves that they exist. While we may never know if we're experiencing them the same way as each other, the fact that we can experience qualia at all is undeniable, and the question of why we can do so is the real question being asked here.
Define it rigorously and show a physical basis and you might have something to work with.