We have not yet grasped the results which the reason alone can attain to.

Problems may be solved in the study which have baffled all those who have sought a solution by the aid of their senses.

To carry the art, however, to its highest pitch, it is necessary that the reasoner should be able to utilise all the facts which have come to his knowledge; and this in itself implies, as you will readily see, a possession of all knowledge, which, even in these days of free education and encyclopaedias, is a somewhat rare accomplishment.

It is not so impossible, however, that a man should possess all knowledge which is likely to be useful to him in his work, and this I have endeavoured in my case to do.

If I remember rightly, you on one occasion, in the early days of our friendship, defined my limits in a very precise fashion." "Yes," I answered, laughing.