Socialism proposes no adequate substitute for the motive of enlightened selfishness that today is at the basis of all human labor and effort, enterprise and new activity.
The problem is that at a lot of big companies, process becomes a substitute for thinking. You're encouraged to behave like a little gear in a complex machine. Frankly, it allows you to keep people who aren't that smart, who aren't that creative.
There's simply no substitute for experience in terms of aviation safety.
Be brave. Take risks. Nothing can substitute experience.
There is never going to be a substitute for face-to-face communication, but we have seen since the alphabet, to the telephone and now the Internet, that whenever people find a new way to communicate, they will flock to it.
I like live audiences, with real people - virtual reality is no substitute.
War springs from the love and loyalty which should be offered to God being applied to some God substitute, one of the most dangerous being nationalism.
Cameras in classrooms are no substitute for greater authority by parents and teachers.
Despite all the public hand-wringing about negative advertising, political veterans will tell you that it persists because, more often than not, it works. But tearing down the other guy has another attraction: It can be a substitute for building much of a case for what the mudslinger will do once in office.
Advertising is, actually, a simple phenomenon in terms of economics. It is merely a substitute for a personal sales force - an extension, if you will, of the merchant who cries aloud his wares.