I thought magesterium was defined as the teaching authority of the Catholic Church. So, wouldn't it be wrong to refer the teaching authority of the Catholic Church as precarious?
Not pissing, just clarifying
Yes, the Latin term magisterium denotes the divine teaching authority of the one true Church. See e.g.
Mortalium animos, Encyclical of Pope Pius XI, 1928. The English translation says "teaching authority" where the Latin original has "magisterium" (or "magisterio")
https://www.vatican.va/content/pius-xi/en/encyclicals/docuмents/hf_p-xi_enc_19280106_mortalium-animos.html (en)
https://www.vatican.va/content/pius-xi/la/encyclicals/docuмents/hf_p-xi_enc_19280106_mortalium-animos.html (la)
Pope Leo XIII says in Satis Cognitum, 1896:
Wherefore, as appears from what has been said, Christ instituted in the Church a living, authoritative and permanent Magisterium, which by His own power He strengthened, by the Spirit of truth He taught, and by miracles confirmed. He willed and ordered, under the gravest penalties, that its teachings should be received as if they were His own.
So, I agree, it would be wrong to call the teaching authority of the Catholic Church as precarious.