Unworthy and hence extremely confident.

Hebrews 4:15-16

¹⁵ For we do not have a high priest who is unable to empathize with our weaknesses, but we have one who has been tempted in every way, just as we are—yet he did not sin. ¹⁶ Let us then approach God’s throne of grace with confidence, so that we may receive mercy and find grace to help us in our time of need.

There's a sense to this combination of sentences. It says, approach the throne confidently when you're in need because you will find grace and mercy, because our Lord understands our weaknesses.
It takes those who are truly clear of their unworthiness to comprehend the purpose of the throne. It is there to provide mercy and grace for people who are needy.

And so strangely enough, it is the one who is consciously unworthy who will be most confident in approaching the throne.
Anyone who clings onto a sense of worth approaches it on account of their own worth. To them the throne is a throne of judgment, one to approach when ready and worthy. But no one is ever worthy.

Oh God wipe the conceit off my face. May my sin be ever before me!
Help me to grasp my unworthiness and give me a heart of faith,
confident of your love
and quick to approach your throne.