Who meant, “all is well” in the ‘end’?
Julian of Norwich;

and this is her context:

“It appears to me that there is a deed that the Holy Trinity shall do on the last day, and when that deed shall be done and how it shall be done is unknown to all creatures under Christ, and shall be until it has been done. —

This is the Great Deed ordained by our Lord God from eternity, treasured up and hidden in His blessed breast, only known to Himself, and by this Deed He shall make all things well; for just as the Holy Trinity made all things from nothing, so the Holy Trinity shall make all well that is not well.” – Julian of Norwich (13th Century Christian Mystic)