Worth while

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References in classic literature ?
"It is when the impossible comes true that life proves worth while," she retorted.
Yet so little did I stand in need of it, with my own high intensity and vitality, that I never thought it worth while to have a cocktail before my own meal when I ate alone.
Many other food courts were available in the grounds; however, they were all very expensive, so it may be worth while taking a picnic, as a whole day needs to be put aside if everything is to be seen.