"Prove all things; hold fast that which is good." 1 Thessalonians 5:21.
With all the MISINFORMATION out there, it's very difficult to "PROVE ALL THINGS". Nearly impossible to ALWAYS know who is telling the TRUTH & who is LYING.
Thankfully, when we read the Bible, we don't have to PROVE ALL THINGS....because the Bible is TRUE, it never LIES. What we do have to PROVE are the human interpretations put on the Bible. Our job is to determine, with the help of the Holy Spirit, which interpretations are TRUE and which interpretations are LIES and to "HOLD FAST" to the true ones.
There are many parts of the Bible that are not hard to understand, even a child can understand them, they are as CLEAR AS NOON DAY.
And then there are other parts that are not so clear, and that is where we often read other humans understanding of those parts and that is where we must PROVE ALL THINGS.