It is necessary to the happiness of man that he be mentally faithful to himself. Infidelity does not consist in believing, or in disbelieving; it consists in professing to believe what he does not believe.
It is only a poor sort of happiness that could ever come by caring very much about our own pleasures. We can only have the highest happiness such as goes along with being a great man, by having wide thoughts and much feeling for the rest of the world as well as ourselves.
It may seem to your conceited to suppose that you can do anything important toward improving the lot of mankind. But this is a fallacy. You must believe that you can help bring about a better world. A good society is produced only by good individuals, just as truly as a majority in a presidential election is produced by the votes of single electors. Everybody can do something toward creating in his own environment kindly feelings rather than anger, reasonableness rather than hysteria, happiness rather than misery.
Life is all one piece. Men err when they think they can be inhuman exploiters in their business life, and loving husbands and fathers at home. For achievement without love is a cold and tight-lipped murderer of human happiness everywhere.
Life is made up of small pleasures. Happiness is made up of those tiny successes. The big ones come too infrequently. And if you don't collect all these tiny successes, the big ones don't really mean anything.