"After a child has arrived at the legal age for attending school,-whether he be the child of noble or of peasant,-the only two absolute grounds of exemption from attendance are sickness and death."

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The scientific value of truth is not, however, ultimate or absolute. It rests partly on practical, partly on aesthetic interests. As our ideas are gradually brought into conformity with the facts by the painful process of selection,-for intuition runs equally into truth and into error, and can settle nothing if not controlled by experience,-we gain vastly in our command over our environment. This is the fundamental value of natural science

— George Santayana