What's the noun for assureth? Here's the word you're looking for.
assurance
The act of assuring; a declaration tending to inspire full confidence; that which is designed to give confidence.
The state of being assured; firm persuasion; full confidence or trust; freedom from doubt; certainty.
Firmness of mind; undoubting, steadiness; intrepidity; courage; confidence; self-reliance.
Excess of boldness; impudence; audacity
(obsolete) Betrothal; affiance.
Insurance; a contract for the payment of a sum on occasion of a certain event, as loss or death. Recently, assurance has been used, in England, in relation to life contingencies, and insurance in relation to other contingencies. It is called temporary assurance, in the time within which the contingent event must happen is limited.
(law) Any written or other legal evidence of the conveyance of property; a conveyance; a deed. In England, the legal evidences of the conveyance of property are called the common assurances of the kingdom. (William Blackstone (1723-1780))
“I have sought an assurance from the chief executive that all the lessons of this whole sorry procedure will be fully learned and the recommendations will be fully implemented.”
“A visitor in the colonies at the time expressed an assurance that the trouble in Mexico was by no means over.”
“He belonged to a unique generation of Irish people whose strength and assurance lay in their ability to think for themselves.”
