The word enlightenment conjures up the idea os some super human accomplishment, and the ego likes to keep it that way, but it is simply your natural state of felt oneness with Being. It is a state of connectedness with something immeasurable and indestructible, something that, almost paradoxically is essential you and yet is much greater than you. It is finding you true nature beyond name and form. The inability to feel this connectedness gives rise to the illusion of separation, from yourself and from the world around you. You then perceive yourself, consciously and unconsciously, as an isolated fragment. Fear arises, and conflict within and without becomes the norm.
Buddha’s simple definition of enlightenment is “the end of suffering”. There is nothing superhuman in that, is there? Of course, as a definition, it is incomplete. It only tells you what enlightenment is not, no suffering. But what’s left when there is no more suffering? The Buddha is silent on that, and his silence implies that you’ll have to find out for yourself. He uses a negative definition so that the mind cannot make it into something to believe in or into a superhuman accomplishment, a goal that is impossible for you to attain. Despite this precaution, the majority of Buddhists still believe that enlightenment is for the Buddha, not for them, at least not in this lifetime.
Reference : The Power of Now. Eckhart Tolle.