People hear things over and over and eventually take them as truth. Instead of searching them out diligently, they accept sayings as Biblical truth. They begin to think they are in the Bible or that God said it. Case in point, the phrase, "Cleanliness is next to Godliness" is not in the Bible. Nor is "the Sinner's Prayer". Nor is salvation by "Accepting the Lord." These are the traditions we grew up with in the American millennium era.
Traditions are nothing new. In the Bible days, the Pharisees had many traditions also. For example, tithing cumin and mint was not a biblical law. (Matthew 23:23). Walking no more than 2000 cubits on the Shabbat had not originated in the Law. They were traditions. The latter arouse from a twisting of Joshua 3:4.
Here is where tradition begats laziness and self-satisfaction.
They replied, "Are you from Galilee too? Search and see that no prophet arises from Galilee." (John 7:52).
This was the Pharisees' contemptuous retort to Nicodemus' attempt to defend Jesus on one point. Their rage and self-satisfaction and scorn was so towering that they forgot that Micah and Jonah and Elisha did come from Galilee, (Micah 1:1, Joshua 19:13, 1 Kings 17:1) and perhaps also Nahum and Hosea had come from Galilee. Rage blinds, as it did to the Pharisees here and on multiple other occasions. Their rage against Jesus blinded them so thoroughly, their self-righteous power-hungry minds were so set against a backwater like Galilee, the Pharisees forgot that prophets do, indeed, come out of Galilee.
Another devastating behavior stemming from tradition that blinds us to the truth is the failure to search the scriptures but instead to think you already know. Behind this wall lies truth. However, the Pharisees had built a wall against it, brick by brick. Each brick was a tradition that eventually blocked their own access to truth.
Has not the Scripture said that the Christ comes from the offspring of David, and comes from Bethlehem, the village where David was?”
Do you ever settle in the pew and look at the bulletin and see that the sermon is going to be on a passage you're extremely familiar with? Does your heart sink, your mind saying, "Aw, man, I already know this one"? I dare to suggest, that is Pharisee talk. The scriptures speak every time they are delved into. It is our job to search them out, even if we think we already know. It isn't that the scriptures aren't fresh, it's that our eyes get dull.
It's a truism that a little knowledge can be a dangerous thing, meaning that a small amount of knowledge can delude people into thinking that they are more expert in their field than they actually are. The Pharisees' knowledge was prodigious, but it was head knowledge without love, and combined with tradition, pride, and self-righteousness, they failed at the critical moment to recognize the Messiah they had been waiting for. (2 Timothy 3:7).
Let's be careful not to assume the facts, but search them out. Let's be diligent to investigate. Nicodemus did. Annas didn't. Let's not rest on tradition, assuming it's Biblical. Cleanliness isn't next to Godliness, holiness is. Search the scriptures diligently with fresh, open eyes. Pray to the Spirit to illuminate them to you. It's harder to do the longer you're a Christian to keep fresh eyes on the Bible, but the Spirit is always fresh and will open your mind to the truths in every case. Peter said that Jesus had the words of eternal life. Eternal words never get stale.