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Benefits received are a delight to us as long as we think we can requite them; when that possibility is far exceeded, they are repaid with hatred instead of gratitude.

Tacitus (2007). “The Annals & The Histories”, p.132, Modern Library
Benefits received are a delight to us as long as we think we can requite them; when that possibility is far exceeded, they are repaid with hatred instead of gratitude.