That's because there are few that have applied themselves towards God. The real disassociation that leads to true knowledge is to give one's life up for their friends. Then again, if you win over your friends what have you gained? Nothing more than you had. This is why this path is so hard but leads to, not theoretical light, but to the Living Light of God. Therefor this knowledge will always be protected from the gross; even if you tell them this secret.