The right of nature... is the liberty each man hath to use his own power, as he will himself, for the preservation of his own nature; that is to say, of his own life.
Thomas HobbesAnd as to the faculties of the mind, setting aside the arts grounded upon words, and especially that skill of proceeding upon generall, and infallible rules, called Science; which very few have, and but in few things; as being not a native faculty, born within us; nor attained, (as Prudence,) while we look after somewhat else.
Thomas Hobbes