— 682 —
Thirdly, For want of intermediate Ideas.
      §11. Thirdly, Our Reason is often at a stand, because it perceives not
those Ideas, which could serve to shew the certain or probable Agreement, or
Disagreement of any two other Ideas: and in this, some Men’s Faculties
far out-go others. Till Algebra, that great Instrument and Instance
of Humane Sagacity, was discovered, Men, with Amazement,
looked on several of the Demonstrations of ancient Mathematicians,
and could scarce forbear to think the finding several of those Proofs
to be something more than humane.
Locke Hum IV, 17, §11, p. 682