Pedantry undertook, even at the very beginnings of the Elizabethan drama, to shackle it with the so-called rules of Aristotle, or classical unities of time and place, to make it keep violent action off the stage and comedy distinct from tragedy.
— from From Chaucer to Tennyson With Twenty-Nine Portraits and Selections from Thirty Authors by Henry A. (Henry Augustin) Beers

In this poem, written and first printed in the year 1821, the author has endeavored, from a survey of the past ages of the world, and of the successive advances of mankind in knowledge, virtue, and happiness, to justify and confirm the hopes of the philanthropist for the future destinies of the human race.
— from Poetical Works of William Cullen Bryant Household Edition by William Cullen Bryant

In this continual variety the mind is kept vividly alive.
— from Across the Plains, with Other Memories and Essays by Robert Louis Stevenson

One pair got nothing, and seeing this the Kol pair gave them of their superfluity and the descendants of these became the Ghasias, who are menials in Kol villages and supported by the cultivators.
— from The Tribes and Castes of the Central Provinces of India, Volume 3 by R. V. (Robert Vane) Russell

The length of the day on Mars is known very accurately, for the rareness of its atmosphere permits us to see readily many of its surface markings.
— from Astronomy for Young Folks by Isabel Martin Lewis