If it be not now, yet it will come

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Not a whit. We defy augury. There’s a special providence in the fall of a sparrow. If it be now, ’tis not to come. If it be not to come, it will be now. If it be not now, yet it will come—the readiness is all. Since no man knows aught of what he leaves, what is ’t to leave betimes?  Let be. 

Reference:  Act V, scene ii