Many people seem to have an Enlightening experience, then subsequently loose it. There is then the sheer frustration of trying to get it back.
But once it is seen that what you essentially are is the spontaneous ‘knowing’ or ‘awareness’ in which all perception takes place, there is no possibility of forgetting it or loosing it. This is because, once seen, it is obvious that any further thought, doubt, emotion or action, only ever appears within ‘knowing’ or ‘awareness’. No amount of mental noise nor the opinions of others can then dissuade you from the obvious fact that any appearance, any phenomena, perception or experience can only ever arise within ‘knowing’ or ‘awareness’.
When you realise that you are essentially that knowing awareness then it is impossible to loose yourself, for you see that you always were and always will be everything and nothing.