"ALL'S WELL THAT ENDS WELL"!

The word "well" appears in 752 verses of the bible.  It is an adverb meaning "OK, going good, properly caried out.  Excellently, commendably, and adequately done."  As an adjective the word "well" indicates "good health, sound in body and mind, proper, fitting, and gratifying!"  As an interjection the word "well" is used to express surprise!!!  In its noun form, it suggests "success or completion"!
Ecclesiastes 7:8 Better is the end of a thing than the beginning thereof    For uncountable billions it will not END on a well-note!  But for a saved few....ALL'S WELL THAT ENDS WELL!

Going by the law of first mention,  the very FIRST time the word "well" appears in the scriptures it is in relation to Cain's acceptance by God.
Genesis 4:7 If thou doest well, shalt thou not be accepted? and if thou doest not well, sin lieth at the door.