Walking and talking are two very great pleasures, but it is a mistake to combine them. Our own noise blots out the sounds and silences of the outdoor world; and talking leads almost inevitably to smoking, and then farewell to nature as far as one of our senses is concerned. The only friend to walk with is one who so exactly shares your taste for each mood of the countryside that a glance, a halt, or at most a nudge, is enough to assure us that the pleasure is shared.

Nature does not teach. A true philosophy may sometimes validate an experience of nature; an experience of nature cannot validate a philosophy. Nature will not verify any theological or metaphysical proposition (or not in the manner we are now considering); she will help to show what it means.

No good poem, however confessional it may be, is just a self-expression. Who on earth would claim that the pearl expresses the oyster?

Good philosophy must exist, if for no other reason, because bad philosophy needs to be answered.

To be ignorant and simple now-not to be able to meet the enemies on their own ground-would be to throw down our weapons and to betray our uneducated brethren who have, under God, no defense but us against the intellectual attacks of the heathen. Good philosophy must exist, if for no other reason, because bad philosophy needs to be answered.