“Waste is worse than loss. The time is coming when every person who lays claim to ability will keep the question of waste before him constantly. The scope of thrift is limitless.”
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Anything that won't sell, I don't want to invent. Its sale is proof of utility, and utility is success.
To invent, you need a good imagination and a pile of junk.
There will one day spring from the brain of science a machine or force so fearful in its potentialities, so absolutely terrifying, that even man, the fighter, who will dare torture and death in order to inflict torture and death, will be appalled, and so abandon war forever.
There is no substitute for hard work.