Do you know what friendship is?' he asked. 'Yes,' replied the gypsy; 'it is to be brother and sister; two souls which touch without mingling, two fingers on one hand.' 'And love?' pursued Gringoire. 'Oh! love!' said she, and her voice trembled, and her eye beamed. 'That is to be two and to be but one. A man and a woman mingled into one angel. It is heaven.
Victor Hugo (2010). “The Works of Victor Hugo”, p.404, BookCaps Study Guides