What does that Bible say about having a clean/circumcised heart? And how to we get it?

The Bible actually mentioned a circumcised heart four different times. It appears first in Deuteronomy 10:16, Deuteronomy 30:6, Jeremiah 4:4, Romans 2:29. But Paul explains this “spiritual” circumcision in Colossians 2:9-13. Paul's tells us what it means to be ‘IN” Christ, where “the fullness of deity dwells.”

Is there any other source, besides the Bible that proves the Bible is inspired by God?

Actually, there are many proofs external to the Bible.

The fields of archaeology, astronomy, oceanography and more all verify the inspiration of the Scriptures. The truth is that there is so much evidence, I could not possibly even begin to list them here. I will however give you some resources where you might find specific information.

Recently I was studying the Holy Bible with a Friend and was shocked to find his version (New American Catholic Bible) contained seven extra books named as follows: Tobit, Judith, Maccabees1, Maccabees2, Book of Wisdom, Book of Sirach, and the Book of Baruch. Why do these books appear in only the Catholic version?