Zwingli learned Greek so he could understand the New Testament in its own terms and Hebrew so he could understand the Old. Such intellectual achievements as study of the Bible’s original languages was so unusual in the early 16th century that S.M. Jackson can write
… a little knowledge of Greek made one in those days a paragon of learning, while if one joined to it a smattering of Hebrew such an accumulation was almost superhuman, and, indeed, it was sometimes hinted, betrayed Satanic influence!
These days it’s equally surprising to find any clerics who have any facility at all in the Biblical languages. Proving, as though proof were needed, that there is nothing new under the sun. Not even ignorant clergy.