Date: 1841

"It is the solar system of the mind."

— Marx, Karl (1818-1883)

Date: 1842

"The images of past delight / Have fleeted from her troubled sight, / And left no perfect form behind / On the dim mirror of the mind"

— Herbert, William (1778-1847)

Date: November 24, 1859

"Although I am fully convinced of the truth of the views given in this volume under the form of an abstract, I by no means expect to convince experienced naturalists whose minds are stocked with a multitude of facts all viewed, during a long course of years, from a point of view directly opposite...

— Darwin, Charles (1809-1882)

Date: November 24, 1859

"A few naturalists, endowed with much flexibility of mind, and who have already begun to doubt on the immutability of species, may be influenced by this volume; but I look with confidence to the future, to young and rising naturalists, who will be able to view both sides of the question with impa...

— Darwin, Charles (1809-1882)

Date: 1864

"Look, now, I melt a gourd-fruit into mash, / Add honeycomb and pods, I have perceived, / Which bite like finches when they bill and kiss,-- / Then, when froth rises bladdery, drink up all, / Quick, quick, till maggots scamper through my brain; / Last, throw me on my back i' the seeded thyme, / A...

— Browning, Robert (1812-1889)