Some ants build; some ants sow and later reap the crop; and some apes fight and have wars although they are not as cruel as people are. But nothing in nature, except for man, ever tries to think of the meaning of life. Nothing climbs above its natural physical needs. No living creature, except for a man, is able to take a risk, and even the risk of death, for the sake of truth. Thousands of martyrs who have lived are a unique phenomenon in the history of all our solar system.