Thematic Bible: Qualified by God

Then I said, Woe is me! for I am dead because I am a man of unclean lips, and I dwell in the midst of a people of unclean lips; for mine eyes have seen the King, the LORD of the hosts. Then one of the seraphim flew unto me, having a live coal in his hand which he had taken with the tongs from off the altar: And he laid it upon my mouth and said, Behold, this has touched thy lips; and it shall take away thy guilt, and thy sin shall be cleansed.

Not that we are sufficient of ourselves to think anything as of ourselves, but our sufficiency is of God, who also has made us able ministers of the new testament, not of the letter, but of the Spirit; for the letter kills, but the Spirit gives life.