Progress is impossible without change, and those who cannot change their minds cannot change anything. – George Bernard Shaw

If you do not agree with the prevalent point of view, be ready to explain why. – Martin H. Fischer (1879–1962)

To be dragged in the wake of the passive flock and to pass a hundred and one times beneath the shears of the shepherd, or to die alone like a brave eagle on a rocky crag of a great mountain: that is the dilemma. – Praxedis Guerrero, Regeneración, 1911 February 18th