Summer fruits are really good, but one annoying thing about them is that you have to eat them at just the right time. With strawberries, peaches, and especially persimmons, you don't want to eat them before they are ripe: they won't taste as good and may make you sick. On the other hand, if you wait too long after they get ripe, they will be rotten. 
    Something similar happens in spiritual development. If a teacher tries to teach a person something he is not ready for, that person will not understand the lesson, will not accept is as true, or will ignore it as irrelevant. Thats why a teacher has to know when the student is ready for any particular lesson and is why only the very basic spiritual truths are ever publicly published in books or places like this blog. 
    On the other hand, a student may be ready to learn, to awaken, and be unable to find a good teacher. This may cause her to give up the quest and continue on with a meaningless materialistic life that ends in death. This is very unfortunate and something we never want to see, especially now in the End Times, which is why spiritual schools are trying hard to locate those people who are ready and willing to learn the truth.