'Confidence' in the Bible

For thus said the Lord Yahweh, the Holy One of Israel, "You will be saved in returning and rest. Your strength will be in quietness and in confidence." You refused,

The work of righteousness will be peace; and the effect of righteousness, quietness and confidence forever.

Rabshakeh said to them, "Now tell Hezekiah, 'Thus says the great king, the king of Assyria, "What confidence is this in which you trust?