Oh I do indeed believe that it is through suffering that we find and grow to love God.
But what St Therese and Etty Hillesum are trying to say is that there are kinds of suffering that God forbids us to go through and are outright sinful.
St. Therese talks about suffering from considering the past and the future, while Etty talks mainly about the latter kind of suffering. Both should not be condoned by the Christian.
Suffering from considering the past is what is talked about by St. Paul: “For godly grief produces a repentance that leads to salvation and brings no regret, but worldly grief produces death” (2 Corinthians 7:10). Suffering from the past, or grief, can be done in two ways: “godly” or “worldly”. Godly grief is looking at our sins, mistakes, and disasters, and offering them to God, but they do not cause regret in us. Why? “For see what earnestness this godly grief has produced in you, what eagerness to clear yourselves, what indignation, what alarm, what longing, what zeal, what punishment! At every point you have proved yourselves guiltless in the matter” (2 Corinthians 7:11). That is, we see those “mistakes” as conduits of grace, as ways for God to bless us. “But where sin increased, grace abounded all the more” (Romans 5:20). As St Augustine said: “For God judged it better to bring good out of evil than not to permit any evil to exist.” And as the Church sings during Easter: “O truly necessary sin of Adam, destroyed completely by the Death of Christ! O happy fault that earned for us so great, so glorious a Redeemer!”
Worldly grief thus does the opposite of this: there is no repentance, virtual or actual, but there is full of regret. For example, look at scrupulosity. It is undeniable that to be scrupulous is a wretched life; it is full of soul-wrenching suffering and anguish brought about by guilt and regret, as well as an exaggerated fear of sinning. There is actual repentance in scrupulosity, but it has virtually no repentance, for if you have repented of your sins and the priest has given you his blessing, why are you still hung up about them? It is full of fear, despair, and death: “…but worldly grief produces death.”
Speaking of fear, suffering about the future, on the other hand is, simply that: fear. Anyone knows how much suffering fear can be, especially those who have clinical anxiety. But God forbids us to be overtaken by fear: “But as for the cowardly, the faithless, the polluted, as for murderers, fornicators, sorcerers, idolaters, and all liars, their lot shall be in the lake that burns with fire and brimstone, which is the second death” (Revelation 21:8).
So both worldly grief and worldly fear must be shunned and looked down upon; these types of suffering are not worthy even to be offered to God. But it is easier said than done.
(continued)