Stand you awhile aloof. – Cesario,
Thou know’st no less but all. I have unclasp’d
To thee the book even of my secret soul.
Therefore, good youth, address thy gait unto her.

– William Shakespeare

Twelfth Night, Act 1, Scene 4. Duke Orsino bares his soul to his pageboy Cesario (Viola) about his passion for Lady Olivia. He wants Cesario to go to Olivia and be the messenger of his love for her.