Quotation:

"Men, it has been well said, think in herds..."

Long quote:
"Men, it has been well said, think in herds; it will be seen that they go mad in herds, while they only recover their senses slowly, one by one."

Extraordinary Popular Delusions and the Madness of Crowds

Charles Mackay (1814-1889) Scottish poet, journalist, author, anthologist, novelist, and songwriter. His farsighted book Extraordinary Popular Delusions and the Madness of Crowds is an early study of crowd psychology and panic.

herd (noun): a large group of animals (or people); a crowd
mad (adjective): mentally ill, insane
recover (verb): find again; regain possession of
senses (noun): sanity; ability to think rationally

Contributor: Josef Essberger