When flying an airplane, one cannot take care of other planes. Everyone has to take care of his own plane, and if there is any danger, no other plane can help another in that condition. Similarly, at the end of life, when one has to go back home, back to Godhead, everyone has to take care of himself without help rendered by another. The help is, however, offered on the ground before flying in space. Similarly, the spiritual master, the father, the mother, the relatives, the husband and others can all render help during one's lifetime, but while crossing the sea one has to take care of himself and utilize the instructions formerly received. (SB 1.15.50 pp)