Infallibility
<<unable to fail>>
The belief that God’s Word will not fail in its purpose and so is totally reliable and trustworthy. It shall accomplish the purpose for which it was sent (Isa 55:11). God speaks and fulfills His promise, not like man whose word is often unreliable and so makes him into a liar (Num 23:19).
Man will fail, but God never will
claims to be infallible and true because this is the nature and perfection of God's character (2 Sam 22:31; Ps 12:6, 19:7; Prov 30:5; Mt 5:48; Jn 17:3,17; 2 Pet 1:20,21). Over time, mistranslations and different cultural understanding have (to a limited degree) clouded the original, untarnished God-breathed writings (2 Tim 3:16,17). As we can easily bring a wrong meaning or interpretation to Bible passages we must diligently be open and submissive to the Spirit who leads into all truth (Jn 16:13; 2 Tim 2:15).
The Bible does not teach that the apostles were infallible, apart from what was written by them and incorporated into Scripture. What originates with man may fail to come to pass but we can’t stop what is ‘of God’ (Act 5:38,39).
Immutability describes God's unchangeableness (Mal 3:6; Jas 1:17).
See also: Bible, error, failure, immutable, inerrancy, reliable, trustworthy, truth.