Michael Goodman, Philosophy, Humboldt State University
"It is not...the object of logic to determine
whether conclusions be true or false; but whether
what are asserted to be conclusions are conclusions." ---Augustus De Morgan
"The object of reasoning is to find out,
from the consideration of what we already know,
something else which we do not know." ---Charles Sanders Peirce
The text is First Logic, 2/e, by Michael F. Goodman.