“Doubt is not always a sign that a man is wrong; it may be a sign that he is thinking.”

“Signs may be but the sympathies of nature with man.”

“Sometimes signs are just signs; sometimes they lead you in the wrong direction”

“Moral certainty is always a sign of cultural inferiority. The more uncivilized the man, the surer he is that he knows precisely what is right and what is wrong. All human progress, even in morals, has been the work of men who have doubted the current moral values, not of men who have whooped them up and tried to enforce them. The truly civilized man is always skeptical and tolerant, in this field as in all others. His culture is based on "I am not too sure.”

“Rascals are always sociable, and the chief sign that a man has any nobility in his character is the little pleasure he takes in others company.”

“I think they should change STOP signs to PAUSE signs.”