Life may be recognized in two aspects: the known and the unknown. What is generally called life is its known aspect as its other aspect is unknown to many. The unknown aspect may be called the immortal, the eternal life, and the known aspect may be called mortal life. What we generally know of life is its mortal part; the experience we have through our physical being gives us the evidence of life, and therefore the life we know is the mortal life. The immortal life exists, but we do not know it; it is our knowledge which is absent, not the immortal life.