“In a state therefore of great equality and virtue, where pure and simple manners prevailed, the increase of the human species would evidently be much greater than any increase that has been hithert...”

“I do not know that any writer has supposed that on this earth man will ultimately be able to live without food.”

“The superior power of population cannot be checked without producing misery or vice.”

“I think it will be found that experience, the true source and foundation of all knowledge, invariably confirms its truth.”

“The great and unlooked for discoveries that have taken place of late years have all concurred to lead many men into the opinion that we were touching on a period big with the most important changes.”

“Population, when unchecked, goes on doubling itself every 25 years or increases in a geometrical ratio.”

“When man will return to nature, nature will return to him.”

“The sky is an enormous man.”

“When the full-grown poet came,Out spake pleased Nature (the round impassive globe, with all its shows of day and night,) saying, He is mine;But out spake too the Soul of man, proud, jealous and unr...”

“Heaven is under our feet as well as over our heads.”

“Wherever forests have not been mowed down, wherever the animal is recessed in their quiet protection, wherever the earth is not bereft of four-footed life - that to the white man is an 'unbroken wi...”

“Earth is the holiest place in the Universe, loving the earth, and loving life is the way to generate positive vibrations.”

“Unfortunately, in war, there are casualties, including among the civilian population.”