Thanks for your question.
What is the center of the Bible? A quick survey on the net reveals that many think that Psalm 118:8 is the center verse of the Bible. Others dispute that claim. However, it is a good verse to consider to be at the heart of the Bible:
"It is better to trust in the Lord than to put confidence in man." Psalm 118.8
The central theme of the Bible, a much more important topic, is found in Deuteronomy 14:21, "As truly as I live, all the earth shall be filled with the glory of the LORD." See aso, Psalm 72:19; Habbakkuk 2:14; Daniel 7:27; Matthew 6:10; Revelation 5:10; 11:15.
I hope you have found this helpful.