The constant revamping of the production process, the uninterrupted disturbance of all social conditions, and the everlasting uncertainty and agitation of society distinguish the bourgeois era from all earlier ones. All fixed, fast-frozen relationships, with their train of ancient and venerable prejudices and opinions, are swept away. All new-formed relationships become outdated before they can solidify. All that is fixed melts into air, all that is sacred is profaned, and people are at last compelled to face with sober senses their real conditions of life, and thier relations with each other.

-Some guy, in some manifesto, in 1848