Every man is liable to suffer in hell, and it is difficult to be certain of exemption therefrom. According to the Prophet, there are 70,000 apartments in hell, each apartment containing 70,000 doors, each door having 70,000 serpents and 70,000 scorpions; and the unbelievers and the evil-minded cannot help passing through each of them. . . .
Such is the description of hell, and of its subdivisions which correspond to the number of earthly desires. The factor seven in the subdivisions corresponds to the seven organs used in the commission of sins.
If you wish to know your destiny, you should look at your character, since your natural inclinations presage your destiny. If they tend to good, you are not intended for hell; if they tend to evil, you are destined therefor. As the Qurân says, “The virtuous are to be blessed in heaven, the vicious are to suffer in hell.”
Here is a secret. When death takes away the earthly veil (the body), the desire-nature is yet more or less tainted with earthly impurities. In some cases the mirror of the soul may be too darkened to admit of any cleansing. Such a soul is eternally barred from the Divine Presence. In other cases, (i. e. unrighteous believers), the rust is capable of being cleansed, and so the desire-nature is exposed to hell-fire to the extent of the purification needed. The time varies from a brief moment to 7,000 years. No man quits this earth without some impurity, however slight, in him.—Letter 99.