Paul doesn't condemn the aspects of his background listed in verses 5-6 as bad in themselves but rather as worthless in comparison to knowing Christ. It means that I should remember that all that I am in myself is as filthy rags in God's sight 4 and that my salvation from start to finish is a gift from God. Some Bible scholars think that Paul is referring to the Jews, who opposed Paul throughout his ministry. However, Paul continued to love the Jews despite the trouble that they caused him, but he clearly had no use for the Judaizers. Thus, I think that Paul is more likely warning against Judaizers than Jews.
Most commentaries give several reasons why the tribe of Benjamin stood high in Jewish estimation.
All rights reserved. Used under License.