in principle
What does "in principle" mean in this sentence?

"For the true revolution is not ‘in principle,’ not in ‘The Idea’—but in the human heart"

Does the sentence mean:

"for the true revolution in principle (principally) in not in the idea but is in the human heart"

Question

in principle
What does "in principle" mean in this sentence?

"For the true revolution is not ‘in principle,’ not in ‘The Idea’—but in the human heart"

Does the sentence mean:

"for the true revolution in principle (principally) in not in the idea but is in the human heart"

Answer

Here, "in principle" means "based on logical reasons". The phrase means that true revolution doesn't come from arguing about the facts, by appealing to people's minds, It comes from the feelings of the people, what is in their heart. To lead a revolution, you rely on emotion, not facts, to rally your support.