Masses of facts, like masses of matter, are capable of very minute subdivisions; and when we know the law of combination, they are readily divided or reunited. To know the law, in any case, is to ascend to the source; and without that knowledge the mind gropes in darkness.
The Logic and Utility of Mathematics; With the Best Methods of Instruction Explained and Illustrated, Introduction (p. 21), A.S. Barnes & Burr Co. 1860