The sciences, even the best,-mathematics and astronomy,-are like sportsmen, who seize whatever prey offers, even without being able to make any use of it.
The assertion that 'all men are created equal' was of no practical use in effecting our separation from Great Britain and it was placed in the Declaration not for that, but for future use.
All the facts of nature are nouns of the intellect, and make the grammar of the eternal language. Every word has a double, trebleor centuple use and meaning.