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> 多角的な視点を **持たねば** 、真実には至れないと、もはや自分は知っているのだから。

I don't have the slightest idea what たねば stands for. Is that another way of
saying 持たなければ?
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grammar
Meaning of 持たねば?
「ねば」 is a literary way of saying 「もし・・ないなら」; therefore, it is used to form a
negative if-clause.

> "Because I already know that if I don't have diversified perspectives, I
> won't be able to reach the Truth."
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I don't know the reason, but since the two comments posted by me to OP's
question were erased, I'll post nearly the same content as the comments as an
answer.

> Is that another way of saying 持たなければ?

Yes.

ねば means 「もし・・ないなら」 as is written in l'électeur's answer (+1 upvote).

The most important information about ねば in 持た **ねば** is that it is an **old
expression** of Japanese language for なければ in 持た **なければ**.

This expression is still relatively commonly used even now, as well as in
written language, but sometimes used in spoken language.  
However, since it comes from an old expression, there is a feeling/nuance of
masculine, old fashioned, dignified and/or arrogant.
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