Joy is Not Happiness; It is Happy - A Matter of Luck

George Johnston in "Convocation Address: Queen's University, 29/5/71" distinguishes between happiness and joy.

Love is very dear.
getting our own way
and so forth
cost the Earth.

But joy
     is free,
unasked-for, unexpected, undeserved
     as an honorary degree.
These are the last rhymes this morning
     from me.
And a joy it is to mark the occasion with such mirth.

George Johnston. Endeared by Dark: The Collected Poems.

And so for day 2237