Texts used by Bach in his Cantatas are from as early as the 15th century and extend to the late 17th. The author of the aria in question, 5 (S), is unknown. The next verse is from Jahn (Janus) 1661. First publication of the cantata in 1717.

It must be pointed out that the German of the period was diverse with differences from modern German.

Finally, Alanabit is correct. Translation into idiomatic English requires changes that alter the literal translation, which would not make sense to an English-speaker. Note the literal translation of this aria given at the website given in a previous post (which agrees with some of the suggestions here); theologically the first line makes no sense, and is not comprehensible in any sense.