[Necessity is] the sum of all things, which being now existent, conduce and concur to the production of that action hereafter, whereof if any one thing now were wanting, the effect could not be produced. This concourse of causes, whereof every one is determined to be such as it is by a like concourse of former causes, may well be called (in respect they were all set and ordered by the eternal causes of all things, God Almighty) the decree of God.
Thomas HobbesMan is distinguished not only by his reason, but also by this singular passion, from all other animals.
Thomas HobbesAnd therefore in geometry (which is the only science that it hath pleased God hitherto to bestow on mankind), men begin at settling the significations of their words; which settling of significations, they call definitions, and place them in the beginning of their reckoning.
Thomas Hobbes