C.S. Lewis’s The Problem of Pain (1940) provides a systematic theological and philosophical defense of God's goodness in a world full of suffering. The Central Dilemma
: Lewis acknowledges this is "mostly speculation." He suggests animals may find a sense of "self" and immortality through their relationship with humans.
The "greatest risk" God took; it makes love possible but also evil.
Like a or an artist , God desires our perfection and sanctification, not just our transient happiness.
If you'd like to explore this further,g., from an atheist or alternate theological view) A list of his for a presentation C.S. Lewis on the Problem of Pain
