“Suffering without knowledge, without remedy, is animal life. One who cannot understand that he is suffering and who thinks that he is very well off is in animal consciousness, not human consciousness. The human being should be cognizant of suffering the threefold miseries of this planet. One should know that he is suffering in birth, suffering in death, suffering in old age and suffering in disease, and one should be inquisitive as to how he may avoid the suffering. That is real research work.” (Shrila Prabhupada, Easy Journey To Other Planets, Ch 2)