Buck never allowed himself to be bullied into doing anything that went against his principles...
It's not just a matter of principle.
...a man of principle.
...a violation of the basic principles of Marxism...
The doctrine was based on three fundamental principles.
These people lack all understanding of scientific principles.
...the principles of quantum theory.
I agree with it in principle but I doubt if it will happen in practice.
Even assuming this to be in principle possible, it will not be achieved soon.
He would vote against it on principle...
His father, on principle, did not like to hear requests for money.