According to Catholicism, what is meant by the Church being indefectible? One of the properties of the Church according to Catholicism is indefectibility. What does this mean and where does this doctrine originate?
&quot;Indefectibility&quot; is, according to Catholic Dictionary by Fr. John Hardon, S.J., the

Imperishable duration of the Church and her immutability until the end of time. The First Vatican Council declared that the Church possesses

an invincible stabilityinvictamque stabilitatem

and that,

being founded upon the Rock, will stand firm to the end of the world.fundata super petram ad finem sæculorum usque firma stabit.

([Latin:] Denzinger 3013, 3056)
The Church's indefectibility, therefore, means that she now is and will always remain the institution of salvation, founded by Christ. This affirms that the Church is essentially unchangeable in her teaching, her constitution, and her liturgy. It does not exclude modifications that do not affect her substance, nor does it exclude the decay of individual local churches or even whole dioceses.