There is no tyranny in the world more hateful than that of ideas. Ideas bring ideophobia, and the consequence is that people begin to persecute their neighbors in the name of ideas. I loathe and detest all labels, and the only label that I could now tolerate would be that of ideoclast or idea breaker.

Recalled by Walter Starkie from a conversation he had with Unamuno, as related in the Epilogue of Unamuno.