“The basic principles of logic dictate that a statement cannot be both true and false at the same time... and that a statement must be either true or false... Lucy is lying, or she is crazy, or she is telling the truth. She can’t be some combination, and she can’t be none of those things... The laws of logic dictate that she must be one of them... Notice how practical common sense about the suposed impossibility of other worlds doesn’t come into the equation.”

“Logic!" said the Professor half to himself. "Why don't they teach logic at these schools? There are only three possibilities. Either your sister is telling lies, or she is mad, or she istelling the truth. You know she doesn't tell lies and it is obvious that she is not mad. For the moment then and unless any further evidence turns up, we must assume that she is telling the truth.”

“We must look to Mary's example to know how to deal with the glorious impossibilities of God. Look how she turned the world upside down by making one simple statement ...”

“A lie is a statement that something is, which is not. then, since the Spirit's statement or conception of anything necessarily makes that thing exist, it is logically impossible for it to conceive a lie. Therefore the Spirit is Truth. Similarly disease and death are the negative of life, and therefore the Spirit, as the Principle of life, cannot embody disease or death in its Self-contemplation. In like manner also, since it is free to produce what it will, the Spirit cannot desire the presence of repugnant forms, and so one of its inherent Laws must be Beauty. In this treefold Law of Truth, Life and Beauty, we find the whole underlying nature of the spirit, and no action on the part of the individual can be at variance with the Originating Unity which does not contravert fundamental principles.”

“To make a statement that one knows is false is more honest than to make a statement that one knows is true.”

“The only ethical principle which has made science possible is that the truth shall be told all the time. If we do not penalize false statements made in error, we open up the way for false statements by intention. And a false statement of fact, made deliberately, is the most serious crime a scientist can commit.”