I did not hear what you said, but I absolutely disagree with you. - Augustus De Morgan

I am far from saying that this Treatise will be easy; the subject is a difficult one, as all know who have tried it.

The lowest steps of the ladder are as useful as the highest.

Aspiring to lead others, they have never given themselves the fair chance of being first led by other others into something better than they can start for themselves; and that they should first do this is what both those classes of others have a fair right to expect. New knowledge... must come by contemplation of old knowledge... mechanical contrivance sometimes, not very often, escapes this rule.