During quiet time today

This is a "message" he wrote to his cousin, Matthew, today during quiet time...

Having trouble? Here, let me help -

HA HPE OOU [TSJ] MAFU KUM TU [PFS] R HAES LADR
Hi, hope you [had a good song] Matthew. Come to [PFS] our house later.

The brackets are the unintelligable parts to this, parts he doesn't even know how to interpret.

Still, impressive I'd say.