Lux in tenebris
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Undoubtedly, option #3 is the best. It fits in all aspects. It is pleasant, gentle, and reflects the entire range of emotions of the heroes.
Евангелие от Иоанна, 1.5: Lux in tenebris lucet, et tenebrae eam non comprehenderunt. Свет во тьме светит, и тьма не объяла его.
