sorry, i misunderstood what you meant with ''not coming back''.

yes, that is why you need a master/teacher to guide you. so you won't go crazy and stay that way.

only with wanting to have a master to guide you there are two problems;
- we western people have trouble to have blind faith in others. the only way your teacher can protect you is by your faith in him, that gives him the power to protect you.
- a lot of masters (well, who call themself masters/guru's) of a plane or world, aren't skilled enough and powerfull enough to guide a disciple through a world, and thus sometimes it goes wrong.