"Common sense will thus indicate a certain abstaining from eating of it.
"Then one may extend his argument to things of a greater importance, but taking great care to keep within the narrow limits of rudimentary logic.
"One must be impregnated with this principle:
"Two things equal to a third demand an affirmative judgment or decision.
"In the opposite case the negative deduction is enjoined.
"It is by deductions from the most ordinary facts that one succeeds in making common sense intervene automatically in all our judgments.
"What would be thought of one who, finding himself in a forest at the time of a violent storm, would reason as follows:
"First: The high summits attract lightning.
"Secondly: Here is a giant tree.
"Thirdly: I'm going to take refuge there.