The defiance of the good atheist hurled at an apparently ruthless and idiotic cosmos is really an unconscious homage to something in or behind that cosmos which he recognizes as infinitely valuable and authoritative: for if mercy and justice were really only private whims of his own with no objective and impersonal roots, and if [...]

Anger–no peevish fit of temper, but just, generous, scalding indignation–passes (not necessarily at once) into embracing, exultant, re-welcoming love. That is how friends and lovers are truly reconciled. Hot wrath, hot love. Such anger is the fluid that love bleeds when you cut it.
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C.S. Lewis, Letters to Malcolm: Chiefly on Prayer (San Diego: Harcourt Brace [...]