“An invasion of armies can be resisted, but not an idea whose time has come”
“One resists the invasion of armies; one does not resist the invasion of ideas.”
“No army can stop an idea whose time has come”
“No army can withstand the strength of an idea whose time has come.”
“More powerful than the mighty armies is an idea whose time has come.”
“Better than the tread of mighty armies is an idea whose time has come.”