For behavior, men learn it, as they take diseases, one of another.

Emerson - for behavior - wist_info quote

Ralph Waldo Emerson
Ralph Waldo Emerson (1803-1882) American essayist, lecturer, poet
“Solitude and Society,” Atlantic Monthly (1857-12)

Paraphrase of Shakespeare, King Henry IV, Part 2, Act 5, sc. 1: "It is certain that either wife bearing or ignorant carriage is caught, as men take diseases, one of another: therefore let men take heed of their company." Sometimes misattributed to Francis Bacon.