Spiritual death
The concept of spiritual death has varying meanings in various uses and contexts.
Buddhism
Although Buddhists occasionally use the term 'spiritual death,' there is no consensus about the meaning because the Buddha himself never used the term, hence the controversy. It has crept into use in recent decades. The closest he came to it, is in the term Parābhava, meaning 'spiritual ruination.' The various ways to spiritual ruination is expounded in the Parābhava Sutta. For example, the Sutta says:‘If a man is fond of sleep, fond of society, and does not exert himself, but is idle and ill-tempered, that is the cause of spiritual ruination.’
The Sutta concludes:
'‘Having contemplated these ruined men in the world, the wise and noble man with perfect vision of things according to reality partakes of the world of the fortunate.'
For Buddhadasa spiritual death stems from attachment to good and evil, and means dukkha, i.e. 'suffering'. He says:
"Once we know about good and evil, we attach to them... This causes dukkha and dukkha is death, spiritual death."
Thus, for Buddhadasa spiritual death stems from attachment to good and evil, and equals suffering; whereas for Christianity, it stems from sin, and equals either separation from God, or the death of the soul. It is hard to see, from Buddhadasa's point of view, in spiritual death, what actually dies.
Sangharakshita uses the term "spiritual death" to describe insight meditation practice. In this case, spiritual death is something good, favourable.
He says:
"The term 'spiritual death' may be slightly off-putting, but it isn’t meant to suggest physical death. What ‘dies’ are all our illusions and delusions about who we are and how things are. This is usually spoken of as ‘insight practice’.".
Christianity
In Christian theology, spiritual death is separation from God caused by sin."Your sins have separated you and God".
This spiritual death is alternatively regarded as the death of the soul:
"The soul that sins shall die.".
Judaism
Ezekiel 18:4 is translated as "The soul that sins shall die," by both Christians and Jews. But the nature of the soul in Judaism is uncertain. So how Jews understand Ezekiel is a matter of controversy.And therefore what Spiritual Death means in Judaism is uncertain. Nonetheless, if spiritual death is the death of the soul, sin is the cause of it, whatever it is.
Hinduism
Spiritual death is dealt with in the Bhagavad Gita Chapter 16, which says that those of demoniac nature engage in harmful, horrible works meant to destroy the world. They become envious of God, who is situated in their own bodies. Being the lowest among men, they are cast into demoniac life, and never approach Krishna. Gradually they sink down to the most abominable type of existence. Here death means rebirth in the demonic realm, as well as separation from God. Whether the soul is destroyed in unclear, but certainly the Hindus and Christians are united on the cause of spiritual death, namely evil conduct or sin.Theosophical Society
For , spiritual death stems from sinfulness, and equals the death of the soul, or separation between one's higher and lower nature, or between the soul and the body. Here is a quote from Blavatsky:"While yet in the body which has lost its higher “Soul” through its vices, there is still hope for such a person. He may be still redeemed and made to turn on his material nature; in which case either an intense feeling of repentance, or one single earnest appeal to the Soul that has fled, or best of all, an active effort to mend one’s ways, may bring the Soul back again. The thread or connection is not altogether broken, so it is not yet beyond hearing a strong spiritual appeal."
And this is from Geoffrey Hodson:
"When a person deliberately and without due thought of the consequences—especially broken vows—gives up the whole enterprise of endeavoring to quicken the rate of evolutionary development for the sake of all humankind, he becomes traitorous... When a person does fall by continuing to direct attention to material goals; to assume old and undesirable habits of body; and to take pleasure in uncontrolled, sensual emotions and selfish, possessive, prideful thinking, then inevitably a curtain or veil is drawn across the hitherto gradually thinning barrier between his higher and the lower natures, thereby shutting off communication between the immortal, spiritual soul and the mortal, personal human being."
Socrates
Socrates taught that whereas single acts of wrongdoing injure the soul, multiple or serious acts of wrongdoing, or those that go unpunished, threaten ultimately to ruin it."The most exquisite and devastating damage one can do to one's soul, then, is through wrongdoing."
Latter-Day Saints
Latter-Day Saints say there are two forms of spiritual death. Firstly, humans are spiritually dead until they are redeemed:“All mankind, by the fall of Adam being cut off from the presence of the Lord, are considered as dead, both as to things temporal and to things spiritual”
Secondly, spiritual death comes as a result of disobedience. Sins make humans unclean and unable to dwell in the presence of God.
Through the Atonement, Jesus Christ offers redemption from both types of spiritual death.