It was the problem of evil that urged you on.

正是邪恶的问题驱使你前行。

Optimism, spelled with a capital O and as expounded by the German philosopher, Leibniz, was an attempt to answer the age-old problem of evil.

乐观主义，用大写字母 O 拼写， 正如德国哲学家莱布尼茨 (Leibniz) 所阐释的那样，是试图回答由来已久的邪恶问题。