Why Philosophy: From Bertrand Russell

If we are not to fail in our endeavour to determine the value of philosophy, we must first free our minds from the prejudices of what are wrongly called “practical" men. The “practical man, as this word is often used, is one who recognizes only material needs, who realizes that men must have food for the body, but Is oblivious of the necessity of providing food for the mind. If all men were well off, if poverty and disease had been reduced to their lowest possible point, there would still remain much to be done to produce a valuable society; and even in the existing world the goods of the mind are at least as important as the goods of the body. It is exclusively among the goods of the mind that the value of philosophy is to be found; and only those who are not indifferent to these goods can be persuaded that the study of philosophy is not a waste of time. 

. . . Philosophy is to be studied, not for the sake of any definite answers to its questions, since no definite answers can, as a rule, be known to be true, but rather for the sake of the questions themselves; because these questions enlarge our conception of what is possible, enrich our intellectual imagination and diminish the dogmatic assurance which closes the mind against speculation; but above all because, through the greatness of the universe which philosophy contemplates, the mind also is rendered great, and becomes capable of that union with the universe which constitutes its highest good.

Bertrand Russell, The Problems of Philosophy (Oxford: Oxford University Press, 1912), selections from Chapters 1, 14, and 15.