December 30

The very existence of man’s intelligence proves his immortality; moreover, darkness proves the presence of light, for without light there would be no shadow. Poverty proves the existence of riches, for, without riches, how could we measure poverty? Ignorance proves that knowledge exists, for without knowledge how could there be ignorance? Therefore, the idea of mortality presupposes the existence of immortality—for if there were no Life Eternal, there would be no way of measuring the life of this world! 
- ‘Abdu’l-Baha  (From a talk, November 10, 1911; ‘Paris Talks: Addresses given by 'Abdu'l-Bahá in Paris in 1911-1912’)