Syntax in this excerpt by Carrie Chapman Catt

"The object of the life of an organized movement is to secure its aim. Necessarily, it must obey the law of evolution and pass through the stages of agitation and education and finally through the stage of realization. As one has put it: 'A new idea floats in the air over the heads of the people and for a long, indefinite period evades their understanding but, by and by, when through familiarity, human vision grows clearer, it is caught out of the clouds and crystalized into law.'"