Of yourself you could come with soft flight and nestle against my heart, if you would: seized against your will, you will elude the grasp like an essence – you will vanish – ere I inhale your fragrance.
– Charlotte Bronte
Jane Eyre, Chapter 27. When Rochester realizes that Jane is leaving him, he physically seizes her. But he knows that if he holds her against her will, Jane will disappear like an essence (simile) before he can enjoy her fragrance. So he frees her from his grasp.