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When an engineer has built a bridge, the fact that a cat can pass over the bridge is no proof that the bridge is good. A train must pass over it to prove its strength.

Richard Wurmbrand
Cat, Bridges, Facts
Richard Wurmbrand (2017). “Tortured for Christ: 50th Anniversary Edition”, p.92, David C Cook
When an engineer has built a bridge, the fact that a cat can pass over the bridge is no proof that the bridge is good. A train must pass over it to prove its strength.