The test of all beliefs is their practical effect in life. It be true that optimism compels the world forward, and pessimism retards it, them it is dangerous to propagate a pessimistic philosophy. One who believes that the pain in the world outweighs the joy, and expresses that unhappy conviction, only adds to the pain. … Life is a fair field, and the right will prosper if we stand by our guns.

Let pessimism once take hold of the mind, and life is all topsy-turvy, all vanity and vexation of spirit. … If I regarded my life from the point of view of the pessimist, I should be undone. I should seek in vain for the light that does not visit my eyes and the music that does not ring in my ears. I should beg night and day and never be satisfied. I should sit apart in awful solitude, a prey to fear and despair. But since I consider it a duty to myself and to others to be happy, I escape a misery worse than any physical deprivation.