“Love is impossible without bite marks.”

Source: In Praise of Love

Burns (1828).
1820s, Critical and Miscellaneous Essays (1827–1855)

To J.W. http://www.emersoncentral.com/poems/to_jw.htm, st. 4 <br class="br">1840s, Poems (1847)

Source: The Revolt of the Angels (1914), Ch. XXXV
Context: The archangel Michael took supreme command. He reassured their minds by his serenity. His countenance, wherein his soul was visible, expressed contempt for danger. By his orders, the chiefs of the thunderbolts, the Kerûbs, grown dull with the long interval of peace, paced with heavy steps the ramparts of the Holy Mountain, and, letting the gaze of their bovine eyes wander over the glittering clouds of their Lord, strove to place the divine batteries in position. After inspecting the defences, they swore to the Most High that all was in readiness. They took counsel together as to the plan they should follow. Michael was for the offensive. He, as a consummate soldier, said it was the supreme law. Attack, or be attacked, — there was no middle course.
"Moreover," he added, "the offensive attitude is particularly suitable to the ardour of the Thrones and Dominations."
Beyond that, it was impossible to obtain a word from the valiant chief, and this silence seemed the mark of a genius sure of himself.

Source: The Body

Original: Adoro le donne che non si lasciano domare. Quelle che graffiano e mordono, ma sanno amare.
Source: prevale.net

As quoted by Anna Freud in the preface to the (1981) edition of Topsy: The Story of a Golden-Haired Chow by Princess Marie Bonaparte.
Attributed from posthumous publications