The Catholic Church says that the Bible and the Catholic Church determines spiritual truth.

Based on 1 Tim 3:15 which reads if I delay, you may know how one ought to behave in the household of God, which is the church of the living God, a pillar and buttress (foundation) of truth. Because it claims to be the one true church it interprets the word church here to mean the Roman Catholic Church. This word means the eccelescia, the body of believers (born again Christians) all over the world.

The Bible says that the Bible alone (Sola Scrptura) determines all spiritual truth alone, the written Word and the living Word.
|
2Tim. 3:16 All Scripture is breathed out by God and profitable for teaching, for reproof, for correction, and for training in righteousness,

2Pet. 1:3 His divine power has granted to us all things that pertain to life and godliness, through the knowledge of him who called us to his own glory and excellence.

John 17:17 Sanctify them in the truth; your word is truth.

John 14:6 Jesus said to him, “I am the way, and the truth…….

Matt. 4:4 But he answered, “It is written” ‘Man shall not live by bread alone, but by every word that comes from the mouth of God.’ “