The soul is hindered in its progress by being called back to earth by mediums and sorrowful friends. Suppose a person is going somewhere, and all the time people call out, "Please stop, we want you", he will never be able to get to his destination; the purpose for which he is going is hindered. To call a soul back would be acting against nature itself. It is better to help the soul to go forward, and that one does by sending one's loving thought.