'Confidence' in the Bible

"Men [and] brothers, it is possible to speak with confidence to you about the patriarch David, that he both died and was buried, and his tomb is with us until this day.

Now as they observed the confidence of Peter and John and understood that they were uneducated and untrained men, they were amazed, and began to recognize them as having been with Jesus.

And now, Lord, take note of their threats, and grant that Your bond-servants may speak Your word with all confidence,

‘Look, you mockers, and marvel, and perish and vanish away;For I am doing a work in your days,A work which you will never believe, even if someone describes it to you [telling you about it in detail].’”

After a long debate, Peter got up and said to them, “Brothers, you know that in the early days God made a choice among you, that by my mouth the Gentiles would hear the message of the gospel and believe.

But I confess this to you, that according to the Way, which they call a [divisive and heretical] sect, I do worship and serve the God of our fathers, [confidently] believing everything that is in accordance with the Law [of Moses] and that is written in the Prophets;

For the king knows about these matters, and I speak to him also with confidence, since I am persuaded that none of these things escape his notice; for this has not been done in a corner.

So keep up your courage, men, for I believe God and have complete confidence in Him that it will turn out exactly as I have been told;

Preaching the kingdom of God, and teaching those things which concern the Lord Jesus Christ, with all confidence, no man forbidding him.