I know a fair bit of Sibelius's (piano) music but did not know this one. It is lovely. Thanks for posting, and kudos to Paul Barton for his committed advocacy of an underrated piano composer. There really are quite some gems among Sibelius's large (and admittedly uneven) piano output.
I'm printing this one out right away to keep at hand in case I need some meditative music for the
church service.