in doubt

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References in classic literature ?
I won't answer for what I may do if I am left much longer to live in doubt of the one man on earth whom I love.
Those who hold with Urban shall have Urban's pardon, while I have Clement's for the Clementist--or he who is in doubt may have both, so that come what may he shall be secure.
To be in doubt, in so mighty a matter as this--to be uncertain which one to adore--was a grievous misfortune.