It has often been said that atheism, in that negative aspect, places a question mark upon our problems.... If atheism places a question mark upon the problem of the universe, it does so in a constructive manner; for that mark points to the direction in which a logical solution may be possible. Such is the mental attitude of the scientist. He places an interrogation point upon his problems and that mark is the impetus, the mental stimulus, that leads him on to take infinite pains in his labors and, as time passes, each question mark is replaced by knowledge; it is knowledge and knowledge alone, reason not faith, that furnishes the period. The Necessity of Atheism