Thomas J. J. Altizer quote: “No suffering can be foreign to a Christian, not even the anguish that comes with the loss of God.”

“The anguish of loss may be redeemed, but can never be mediated.”

William Barrett (philosopher) book Irrational Man: A Study in Existential Philosophy

Source: Irrational Man: A Study in Existential Philosophy (1958), Chapter Seven, Kierkegard, p. 138

“The loss of a friend is like that of a limb; time may heal the anguish of the wound, but the loss cannot be repaired.”

Robert Southey (1774–1843) British poet

“As God hath ordained, so do; else thou wilt suffer chastisement and loss. Askest thou what loss?”

Epictetus (50–138) philosopher from Ancient Greece

Golden Sayings of Epictetus
Context: Canst thou judge men?... then make us imitators of thyself, as Socrates did. Do this, do not do that, else will I cast thee into prison; this is not governing men like reasonable creatures. Say rather, As God hath ordained, so do; else thou wilt suffer chastisement and loss. Askest thou what loss? None other than this: To have left undone what thou shouldst have done: to have lost the faithfulness, the reverence, the modesty that is in thee! Greater loss than this seek not to find! (91).

“The cross is not random suffering, but necessary suffering. The cross is not suffering that stems from natural existence; it is the suffering that comes from being Christian.”

Dietrich Bonhoeffer (1906–1945) German Lutheran pastor, theologian, dissident anti-Nazi

Source: Discipleship (1937), Discipleship and the Cross, p. 86.
Context: The cross is not random suffering, but necessary suffering. The cross is not suffering that stems from natural existence; it is the suffering that comes from being Christian. … A Christianity that no longer took discipleship seriously remade the gospel into only the solace of cheap grace. Moreover, it drew no line between natural and Christian existence. Such a Christianity had to understand the cross as one's daily misfortune, as the predicament and anxiety of our daily life. Here it has been forgotten that the cross also means being rejected, that the cross includes the shame of suffering. Being shunned, despised, and deserted by people, as in the psalmists unending lament, is an essential feature of the suffering of the cross, which cannot be comprehended by a Christianity that is unable to differentiate between a citizen's ordinary existence and a Christian existence. The cross is suffering with Christ.

“No healthy Christian ever chooses suffering; he chooses God's will, as Jesus did, whether it means suffering or not.”

Oswald Chambers (1874–1917) British missionary

“My own Jesus,
They say people in hell suffer eternal pain because of the loss of God – they would go through all that suffering if they had just a little hope of possessing God.”

Matka Tereza (1910–1997) Roman Catholic saint of Albanian origin

On her dark night of spiritual desolation amidst devotion, in a letter addressed to Jesus, as quoted in Mother Teresa: Come Be My Light (2007) edited by Father Brian Kolodiejchuk, p. 192; regarding this quote, Fr. Kolodiejchuk writes: "...when addressing Jesus — that is, in prayer — she could express herself with ease. Fufilling her confessor's request, she sent to him a letter addressed to Jesus, enclosing it with her letter dated September 3, 1959." https://books.google.com/books?id=P4cqT0nK_joC&pg=PA192&dq=%22when+addressing+Jesus+-+that+is,+in+prayer+-+she+could+express+herself+%22&hl=en&sa=X&ved=0ahUKEwjk0IOm5vTOAhVF1x4KHYdRDE4Q6AEIHDAA#v=onepage&q=%22when%20addressing%20Jesus%20-%20that%20is%2C%20in%20prayer%20-%20she%20could%20express%20herself%20%22&f=false
1950s
Context: My own Jesus,
They say people in hell suffer eternal pain because of the loss of God – they would go through all that suffering if they had just a little hope of possessing God. In my soul I feel just that terrible pain of loss, of God not wanting me, of God not being God, of God not really existing (Jesus, please forgive my blasphemies, I have been told to write everything). That darkness that surrounds me on all sides. I can’t lift my soul to God – no light or inspiration enters my soul. I speak of love for souls, of tender love for God, words pass through my words sic, lips], and I long with a deep longing to believe in them! What do I labour for? If there be no God—there can be no soul.—If there is no soul then Jesus—You also are not true... Jesus don't let my soul be deceived—nor let me deceive anyone. In the call You said that I would have to suffer much.—Ten years—my Jesus, You have done to me according to Your will—and Jesus hear my prayer—if this pleases You—if my pain and suffering—my darkness and separation gives You a drop of consolation—my own Jesus, do with me as You wish—as long as You wish, without a single glance at my feelings and pain... I beg of You only one thing—please do not take the trouble to return soon.—I am ready to wait for You for all eternity.

“Wherefore, though good and bad men suffer alike, we must not suppose that there is no difference between the men themselves, because there is no difference in what they both suffer. For even in the likeness of the sufferings, there remains an unlikeness in the sufferers; and though exposed to the same anguish, virtue and vice are not the same thing.”

Aurelius Augustinus book The City of God

Variant translations:
Virtue and vice are not the same, even if they undergo the same torment.
The violence which assails good men to test them, to cleanse and purify them, effects in the wicked their condemnation, ruin, and annihilation.
The City of God (early 400s)
Context: Wherefore, though good and bad men suffer alike, we must not suppose that there is no difference between the men themselves, because there is no difference in what they both suffer. For even in the likeness of the sufferings, there remains an unlikeness in the sufferers; and though exposed to the same anguish, virtue and vice are not the same thing. For as the same fire causes gold to glow brightly, and chaff to smoke; and under the same flail the straw is beaten small, while the grain is cleansed; and as the lees are not mixed with the oil, though squeezed out of the vat by the same pressure, so the same violence of affliction proves, purges, clarifies the good, but damns, ruins, exterminates the wicked. And thus it is that in the same affliction the wicked detest God and blaspheme, while the good pray and praise. So material a difference does it make, not what ills are suffered, but what kind of man suffers them. For, stirred up with the same movement, mud exhales a horrible stench, and ointment emits a fragrant odor.