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Thoroughly convinced of the impossibility of his own suit, a high resolve constrained him not to injure that of another. This is a lover's most stoical virtue, as the lack of it is a lover's most venial sin.

Thomas Hardy (2016). “FAR FROM THE MADDING CROWD (British Classics Series): Historical Romance Novel”, p.130, e-artnow
Thoroughly convinced of the impossibility of his own suit, a high resolve constrained him not to injure that of another. This is a lover's most stoical virtue, as the lack of it is a lover's most venial sin.