Life and death seem to be opposite in definition but I believe it is death that makes life. The two need each other and death is what defines life for me. How do we know what happiness is without sadness? How can we understand life without death? Part of what defines being alive for people and animals alive is the fact that they die. Immortal things are inherently ‘dead’ because they do not know death. Mortality gives us life because death is the place in which living begins and ends.