Hidden in this great 19th-Century prose is the subjunctive form, need , the reason for which I cannot identify right now. The subjunctive was used much more commonly at the time this was written. The subjunctive is the bare form of the infinitive, the same for all persons, singular and plural.
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Ant_222I have read that the verb "need" can be used in modal form only in the present tense.That rings true for modern English, but I seem to recall that need, must, and dareused to be used as modals in the past in the past.