Rather than mere theory, Semler's ideas have all been tested in practice.

The division in his interests goes far beyond mere theory.

The law is not a mere theory or an abstract concept.

Still in default of practical experience what was the value of mere theories?

We want something more than mere theory and preaching now, though.

Had I betrayed that trust over a mere theory?

Not mere theory; actualize it - there has been enough talk and writing.

You can relax; in actual practice, rather than mere theory, it's simply impossible.

This is a mere theory and will not stand a thorough scientific test.

The rules we have set down here are not mere theories or guesswork.