'Confidently' in the Bible

"Brothers, I can tell you confidently that the patriarch David died and was buried, and that his tomb is among us to this day.

Through the Spirit by faith we confidently await the fulfillment of our righteous hope,

They want to be teachers of the Law, yet they do not understand either what they are talking about or the things about which they speak so confidently.

Hence we can confidently say, "The Lord is my helper; I will not be afraid. What can anyone do to me?"