Jalaluddin Rumi said this quote

There came one and knocked at the door of the Beloved.And a voice answered and said, 'Who is there?'The lover replied, 'It is I.''Go hence,' returned the voice;'there is no room within for thee and me.'Then came the lover a second time and knocked and again the voice demanded,'Who is there?'He answered, 'It is thou.''Enter,' said the voice, 'for I am within.