Livets Bog, vol. 1
Terrestrial man's tendency to believe in life after death. "Material" and "spiritual" existence
282. So in the terrestrial zone a distinction is made between "life" and "death", but as man does, in fact, experience that part of his existence which he calls "death", although only in a somewhat unconscious way in an embryonic state, then that experience has not failed to exert its effect on his aware physical consciousness. And so it appears to be evident in most cases that he has the tendency to believe in life after death, that is, in a continued eternal existence after his present life. So he nourishes a desire for an everlasting life and he has an antipathy towards complete annihilation. Such a tendency is the effect of experiencing the unknown life in a very minute way. Terrestrial man therefore makes a distinction between his physical existence and that existence he has the tendency to believe will take place after death, expressing these two concepts respectively as "material existence" and "spiritual existence".
Symbol by Martinus
Symbol no. 8', 'Life's Road - Cosmic Evolutionary Lines