'Sure' in the Bible

not that another one really exists. To be sure, there are certain people who are troubling you and want to distort the gospel about the Messiah.

I went there because of a revelation and presented to them the gospel that I preach among the Gentiles. But I did so only in a private meeting with the influential people, to make sure that I was not running -- or had not run -- in vain.

Therefore, be sure that it is those who are of faith who are sons of Abraham.