The value and utility of any experiment are determined by the fitness of the material to the purpose for which it is used.
A law of nature， lex naturalis， is a precept or general rule found out by reason， by which a man is forbidden to do that which is destructive of his life or takes away the means of preserving the same.
释义：水一旦泼出去，就收不回来，后悔也来不及。
"The poet is the priest of the invisible."